# Introduction (INT)

## INT.SCPScope and Purpose (SCP)

This document is the European Train Control System (ETCS) driver’s handbook. The purpose of this document is to provide a harmonised handbook on the use of the ETCS on-board equipment of the European Rail Traffic Management System ERTMS by the driver of a train fitted with this system.

This document includes all the ETCS Driver Machine Interface (DMI) features, options, configuration parameters, expected system reactions, system messages, degraded situations, etc. from the driver’s viewpoint. Information which is not relevant to the driver has been omitted from this document.

The scope of this document is intended to be limited to Baseline 3 Maintenance Release 1, Baseline 3 Release 2 and Baseline 4 Release 1 ETCS, operated in applicable ETCS system versions (i.e. 1.1, 2.0, 2.1, 2.2, 2.3, 3.0). The scope of this document does not include Class B systems when operated through the ETCS DMI. The clauses included in this harmonised handbook are based on the following ETCS specifications:

1. System Requirements Specification ([2],[3],[4] Subset-026, see section INT.REF Reference documents (REF)).
2. ETCS Driver Machine Interface ([5],[6],[7] ERA_ERTMS_015560, see section INT.REF Reference documents (REF)).
3. Train interface Functional Interface Specification ([8] Subset-034, see section INT.REF Reference documents (REF)).
4. ERTMS Operational Principles and Rules ([10] Appendix A to the TSI OPE, see section INT.REF Reference documents (REF)).
5. ERTMS/ATO System Requirements Specification ([9] Subset-125, see section INT.REF Reference documents (REF)).
6. Characterisation of the rolling stock subsystem ([11] chapter 4 of the TSI Loc&Pas, see section INT.REF Reference documents (REF)).
7. Exceptions for on-board reduced envelopes of ETCS system versions ([12] Subset-153, see section INT.REF Reference documents (REF)).

The clauses pertaining to previous on-board baselines, namely Baseline 3 Maintenance Release 1 and Baseline 3 Release 2, have however been retained, and they can be selected in the main menu.

Moreover, the compatibility chart has been followed to allow only valid combinations of on-board baselines and operated systems to be selected by user. The table is provided below for reference:

TS → OB ↓ | 2.3.0d - 1.0 | 3.4.0 - 1.0 | 3.4.0 - 1.1 | 3.4.0 - 2.0 | 3.6.0 - 1.0 | 3.6.0 - 1.1 | 3.6.0 - 2.0 | 3.6.0 - 2.1 | 4.0.0 - 1.0 | 4.0.0 - 1.1 | 4.0.0 - 2.0 | 4.0.0 - 2.1 | 4.0.0 - 2.2 | 4.0.0 - 2.3 | 4.0.0 - 3.0
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
4.0.0 - 3.0 | 1.1 | 1.1 | 1.1 | 2.3 | 1.1 | 1.1 | 2.3 | 2.3 | 1.1 | 1.1 | 2.3 | 2.3 | 2.3 | 2.3 | 3.0
4.0.0 - 2.2 | 1.1 | 1.1 | 1.1 | 2.2 | 1.1 | 1.1 | 2.2 | 2.2 | 1.1 | 1.1 | 2.2 | 2.2 | 2.2 | 2.2 | INCOMP
4.0.0 - 2.1 | 1.1 | 1.1 | 1.1 | 2.1 | 1.1 | 1.1 | 2.1 | 2.1 | 1.1 | 1.1 | 2.1 | 2.1 | 2.1 | 2.1 | INCOMP
3.6.0 - 2.1 | 1.1 | 1.1 | 1.1 | 2.1 | 1.1 | 1.1 | 2.1 | 2.1 | 1.1 | 1.1 | 2.1 | 2.1 | 2.1 | 2.1 | INCOMP
3.4.0 - 2.0 | 1.1 | 1.1 | 1.1 | 2.0 | 1.1 | 1.1 | 2.0 | 2.0 | 1.1 | 1.1 | 2.0 | 2.0 | 2.0 | 2.0 | INCOMP
2.3.0d - 1.0 | 1.0 | 1.0 | 1.0 | INCOMP | 1.0 | 1.0 | INCOMP | INCOMP | 1.0 | 1.0 | INCOMP | INCOMP | INCOMP | INCOMP | INCOMP

Table INT.SCP.T1: Onboard vs Trackside System Version compatibility chart

Without excluding other uses, this document is designed to be used as a template to produce model-specific manuals. A model-specific manual will be compiled by the rolling stock supplier or the Railway Undertaking (RU) operating it and will be provided to the drivers for each type of rolling stock. Any model-specific manuals will be adapted to include details of the rolling stock and other specific information (e.g. which SRS version is installed, how to physically isolate ETCS from the rolling stock brake system, DMI failure modes).

Model-specific manuals may also be complemented by the end users even further, by adding information such as conditions to be checked by the driver before performing some action on the DMI. Such information is usually defined by operational or company rules. In addition, the model-specific manuals may be extended by the end users to also cover Class B systems when operated through the ETCS DMI, i.e. by means of a Specific Transmission Module (STM).

This document uses Figures to aid understanding by showing an example of an ETCS DMI screen. The relevant part of each Figure has been highlighted with a red square. It should be noted that other parts of the ETCS DMI screen can change for specific situations. In general, the Figure of the ETCS DMI screen could have several variants. However, for simplicity a single diagram has been used to illustrate the required information.

## INT.TERTerms and Abbreviations (TER)

This section defines the terms and abbreviations used in this document. They have been taken from both Subset-023: Glossary of Terms and Abbreviations. v4.0.0 [1] and appendix A and J of the Operational instructions of the Technical Specification for Interoperability (TSI OPE).

Term | Definition
--- | ---
Acknowledgment | Confirmation by an entity that it has received information.
Application level | The different ERTMS/ETCS application levels are a way to express the possible operating relationships between track and train. Level definitions are related to the trackside equipment used, to the way the trackside information reaches the on-board units and to which functions are processed in the trackside and in the on-board equipment respectively.
Automatic Driving mode | The different ERTMS/ETCS application levels are a way to express the possible operating relationships between track and train. Level definitions are related to the trackside equipment used, to the way the trackside information reaches the on-board units and to which functions are processed in the trackside and in the on-board equipment respectively.
Authorising train movements | ERTMS/ETCS on-board equipment mode where the ERTMS/ATO on-board substitutes the driver for acting on the traction/brakes of the train according to the ERTMS/ATO journey profile, with the ERTMS/ETCS on-board equipment still giving full protection against overspeed and overrun.
Driver's acknowledgement | Confirmation by the driver that he/she has taken into account information received through the DMI.
Balise | A passive transponder mounted on the track which can communicate with a train passing over it.
Balise group | One or more balises which are treated as having the same reference location on the track. The telegrams transmitted by all the balises of a group form a track-to-train message.
Baseline | A baseline is defined by a stable kernel in terms of system functionality, performance and other non-functional characteristics.
Cab | The space in the power unit or driving unit of the train containing the operating controls and providing shelter and seats for the driver or engine crew.
Clear (a signal) | To change a signal aspect from its most restrictive aspect to a less restrictive aspect.
Communication Session | The process of initiating and terminating an applicative dialogue between trackside and on-board via radio.
Configuration | The structuring and interconnecting of the hardware and software of a system for its intended application.
Current position | The position of a train measured at a certain moment using defined system co-ordinates.
Danger (aspect) | An indication given by a signal to stop.
Default value | Value stored in the ERTMS/ETCS on-board equipment and used if there is no other value available.
Desk | Inside a cab, the set of operating controls, which is dedicated to preferred movements in a given direction (i.e. forward movements, in which visibility from the cab is provided to the driver). Exception: some single cab locomotives are fitted with one single desk, allowing normal movements in both directions.
Driver acknowledgment | Confirmation by the driver that he/she has taken into account information received through the DMI.
Driver Machine Interface | Train device to enable communication between the ETCS on-board and the driver.
Driver ID | Unique code which identifies a train driver.
End Of Authority | Location up to which a train or a shunting composition is authorised to proceed.
End of Loop Marker | Information transmitted by a balise group intended to mark the beginning of a track area where loop messages can be received. In bidirectional applications, it is possible to have an EOLM at both sides of a loop..
Engine | Association of one or two driving cab(s) of a Rolling Stock unit with one single ERTMS/ETCS on-board equipment. When a driving cab of the engine is used to lead a train/shunting consist, the ERTMS/ETCS on-board equipment supervises the movement of the train/shunting consist the engine belongs to. Each driving cab of an engine allows the driver communicating with the ERTMS/ETCS on-board equipment through the DMI.
ETCS On-Board | The part of ETCS installed on a railway vehicle.
ETCS Identity | The ETCS identity of an on-board equipment is made of a single identity number. The ETCS identity of an RBC, balise group, loop or RIU is composed of a country/region identity number and of an identity number within the country/region.
Eurobalise | Balise compliant with the ERTMS/ETCS specification.
European instruction | An harmonised operational instruction giving a similar content to train drivers across the European Union in order for them to answer in a similar manner to similar situation.
Failure | Effect of an error on the intended service.
Fault | An abnormal condition that could lead to an error in a system. A fault can be random or systematic.
Full supervision mode | ERTMS/ETCS on-board equipment mode giving full protection against overspeed and overrun.
GoA1 | The train is driven manually; but protected by ATP. This GoA can also include providing advisory information to assist manual driving
GoA2 | The train is driven automatically, stopping is automated but a driver in the cab is required to start automatic driving of the train, the driver can operate the doors (although this can also be done automatically), the driver is still in the cab to check the track ahead is clear and carry out other manual functions. The driver can take over in emergency or degraded situations.
In rear of | A term indicating a point on the approach to a specific location on the track, with respect to a given direction.
Information point | Specific location on the track where information can be transmitted from ERTMS/ETCS trackside to ERTMS/ETCS on-board equipment (see also SPOT TRANSMISSION).
Intermittent transmission | A term that encompasses “SPOT TRANSMISSION” and “SEMI-CONTINUOUS TRANSMISSION”.
Interoperability | The ability of a rail system to allow the safe and uninterrupted movement of trains which accomplish the required levels of performance.
Intervention | Where ERTMS/ETCS takes control from the driver by cutting traction power or applying the full service brake and cutting traction power or applying the emergency brake and cutting traction power.
Isolation mode | When the ERTMS/ETCS on-board equipment is disconnected from the vehicle braking system. Isolation is indicated to the driver.
Key | A predefined component or information necessary to be able to encrypt data or interpret encrypted data.
Last relevant balise group | The LRBG is the last balise group marked as linked encountered by the train, whose message is accepted by the ERTMS/ETCS on-board. It is used as a common location reference between the ERTMS/ETCS on-board and trackside equipment.
Level | Contracted form of APPLICATION LEVEL.
Level 0 | A level of ERTMS/ETCS defined to cover instances when the ERTMS/ETCS on-board equipment is operating in an area where the trackside is neither fitted with operational ERTMS/ETCS equipment nor fitted with operational National System.
Level 0 Area | Trackside area in which level 0 operation is supported.
Level 1 | A level of ERTMS/ETCS overlaid onto conventional line side signalling that uses Eurobalises/Euroloop/Radio Infill to pass movement authorities to the train whilst relying on conventional means to determine train position and integrity.
Level 1 Area | Trackside area in which level 1 operation is supported.
Level 2 | A level of ERTMS/ETCS that uses radio to pass movement authorities to the train whilst relying on trackside conventional means to determine train position and integrity.
Level 2 Area | Trackside area in which level 2 operation is supported.
Level 2/3 Area | Trackside area in which level 2 and/or level 3 operation is supported.
Level 3 | A level of ERTMS/ETCS that uses radio to pass movement authorities to the train. Level 3 uses train reported position and integrity to determine if it is safe to issue the movement authority.
Level 3 Area | Trackside area in which level 3 operation is supported.
Level NTC | A level of ERTMS/ETCS that allows the supervision of the train with an existing National Train Control system.
Level NTC area | Trackside area in which level NTC operation is supported.
Level Transition Announcement | A Level Transition Announcement means both a level transition ordered for a further location and a level transition ordered at null distance transmitted as in-fill information.
Level Transition border | A location where the list of levels supported by the trackside changes.
Limit Of Authority | The place beyond which the train has no information but to which the train is authorised to run with a defined target speed higher than zero. The train is expected to receive new information before passing the Limit of Authority.
Limited Supervision mode | ERTMS/ETCS on-board equipment mode giving partial protection against over speed and over run. The driver has to observe and obey to line side signals and operating rules when in limited supervision mode.
Line | A continuous section of railway track.
Linking | A functionality to protect against missing data from BALISE GROUPS by announcing them in advance through LINKING INFORMATION and by checking whether they have been read within a certain EXPECTATION WINDOW.
Local time | The time for ordinary transactions in a locality, which is likely to be shown on station clocks.
Malfunction | A deviation from the specified performance causing the system to work incorrectly. This is normally due to an error or fault in the system.
Mandatory | When it is compulsory to fulfil and to implement a requirement to realise a technically interoperable standard for the ERTMS/ETCS equipment or system.
May | Is permissible.
Max Safe Front End | The maximum safe front end position differs from the estimated position by the Under-reading Amount in the distance measured from the LRBG plus the Location Accuracy of the LRBG.
Min Safe Front End | The minimum safe front end position differs from the estimated position by the Over-reading Amount in the distance measured from the LRBG plus the Location Accuracy of the LRBG.
Message | The combination of application data and protocol data that is transmitted by balise group, loop or radio to a train or from the train to trackside by radio.
Mission (ETCS) | Any train movement started under the supervision of an ERTMS/ETCS on-board equipment in one the following modes: FS, LS, SR, OS, SM, NL, UN, or SN. The ETCS mission is ended when any of the following modes is entered: SB, SH, NP
Movement Authority | Permission for a train (shunting composition) to move to a specific location with supervision of speed.
National System Mode | ERTMS/ETCS on-board equipment mode in which the supervision of the train is ensured by a National System.
National Train Control System | A previously installed train control system defined as Class B system in CCS TSI.
National Values | Values that are transmitted to a train when entering the infrastructure of an administration related to rules and regulations of that administration. National values may be changed within an administrations area.
No Power Mode | ERTMS/ETCS on-board equipment mode in which the on-board equipment is not powered and the emergency brake is commanded.
Non-Leading Mode | ERTMS/ETCS on-board equipment mode when it is connected to an active cab which is not in the leading engine of the train.
Occupied | A track section having any part of a train present upon it.
Odometer accuracy | The extent to which the odometer might make underestimation/overestimation in measuring the movement of the train.
Odometry | The process of measuring the train’s movement along the track. Used for speed measurement and distance measurement.
On Sight mode | ERTMS/ETCS on-board equipment mode that gives the driver partial responsibility for the safe control of his train. In this mode the train possesses a movement authority but the track ahead might be occupied by another train.
Operated System Version | For both trackside and on-board, to operate a system version means to comply with the requirements from all CCS TSI annex A documents, which are applicable to this system version and to the concerned subsystem. The operated system version is ordered by trackside; however, to operate a system version number X within a delimited trackside area only means that an on-board equipment running on this area shall behave according to the set of requirements applicable to the system version number X.Y where X is the one ordered by trackside and Y is the system version number Y (which may be different from the one ordered by trackside) operated by the on-board within this version X.
Operational instruction | Formal information exchanged between signaller and train driver so as to ensure/continue railway operation in specific situations. The operational instruction exists at both national and European levels.
Pantograph | Device for transmitting power from the overhead catenary to the train.
Permitted Speed | The speed limit at which a train is allowed to proceed without ERTMS/ETCS warning and / or intervention.
Point | A section of track equipped so that train routes may converge or diverge.
Post Trip Mode | ERTMS/ETCS on-board equipment mode that is entered after a train trip when the train has been brought to a stand and the driver has acknowledged the situation.
Proceed Aspect | Any signal aspect which permits the driver to pass the signal.
Radio Hole | A known area where it is not possible to establish or maintain a reliable radio connection.
Radio network type | The radio communication network(s) (FRMCS, FRMCS+GSM-R, GSM-R) with which the trackside is equipped for bi-directional data communication between the ETCS on-board equipment and RBCs.
RBC (Radio Block Centre) | A centralised safety unit that receives train position information via radio and sends movement authorities via radio to trains.
Reference Location | A location on the track (e.g. balise group reference location) used as a reference for the information sent from trackside or for the train position.
Release speed | Maximum speed at which a train is allowed to reach the end of its MA.
Reversing Mode | ERTMS/ETCS on-board equipment mode that allows the driver to change the direction of movement of the train whilst controlling the train from the same cab.
Reverse Movement | A train movement in which the driver is situated in the leading engine but the train is moved in the opposite direction to the train orientation.
Roll Away | An unintended and non-powered movement of the train in a direction, which conflicts with the current position of the direction controller in the active desk.
Route | The particular section or sections of track, from a starting point to a point of destination, prepared for train operation.
Route suitability Data | Data transmitted to the ERTMS/ETCS on-board equipment to allow it to check its ability to run on the track as indicated by the movement authority. It includes data related to loading gauge, traction system and axle load category.
Safety | Freedom from an unacceptable risk of harm.
Section | A part of the movement authority.
Section Timer | The timer associated with a section as part of the movement authority. When the timer reaches a value defined by the trackside equipment the section is no longer available and the movement authority for the train is reduced accordingly.
Set Speed | This is an input received from a function external to ETCS for display to the driver. It represents the speed value to which the train speed is regulated by an external device (e.g. by a cruise control system).
Shall | Is mandatory.
Should | Is recommended.
Shunting Mode | ERTMS/ETCS on-board equipment operating mode which allows the train to move in shunting, without available train data.
Shunting Movement | The movement of trains or vehicles other than normal passage along running lines. When vehicles are moved without train data available.
Signal | A visual display device that conveys instructions or provides advance warning of instructions regarding the driver’s authority to proceed.
Signaller | Staff in charge of the route setting of trains /shunting compositions and of issuing instructions to drivers.
Slave Engine | Any engine that is not the leading Rolling Stock unit of a train or shunting consist. The ERTMS/ETCS on-board equipment of the slave engine runs in one of the modes in which it is not controlling the movement of the train/shunting consist (Non-Leading mode, sleeping mode, passive shunting mode).
Sleeping Mode | ERTMS/ETCS on-board equipment mode that is used for the on-board equipment in slave engines controlled by a leading engine.
Spot Transmission | Transmission between trackside and on-board that takes place at discrete locations.
Staff | Employees working for a railway undertaking or an infrastructure manager, or their contractors, undertaking tasks as specified in this Regulation.
Staff Responsible Mode | ERTMS/ETCS on-board equipment mode that allows a driver to take full responsibility for the movement of a train in an equipped area. The ERTMS/ETCS on-board equipment will impose a speed limit in this mode.
Supervised Manoeuvre Mode | ERTMS/ETCS on-board equipment operating mode which allows a shunting consist to be supervised with a Movement Authority, while the engine and its active cab can be located anywhere in the consist.
System | A composite of equipment, skills, and techniques capable of performing or supporting an operational role, or both. A complete system includes all equipment, related facilities, material, software, services and personnel required for its operation and support to the degree that it can be considered a self-sufficient unit in its intended operational environment.
System Failure Mode | ERTMS/ETCS on-board equipment mode entered when a fatal failure which could affect safety is found.
System Version | The system version defines the ERTMS/ETCS mandatory functions that ensure technical interoperability between ERTMS/ETCS on-board equipment and trackside.
Tandem | Two or more traction units mechanically but not electrically coupled together, used in the same train. Each traction unit requires a separate driver. Only one unit is designated as leading, the other units are therefore classed as Non-Leading.
Target | Location where the train speed should be below the given target speed.
Track Condition | Information transmitted to the ERTMS/ETCS on-board equipment to inform the driver and/or the train of conditions ahead. This information is dedicated to other functions than the speed and distance monitoring.
Track Description | Information complementing the Movement Authority and providing as a minimum the, static speed profile and gradient profile. Optionally, it can contain axle load profile, track conditions, route suitability data, areas where shunting is permitted, etc.
Trackside Equipment | The equipment with the aim of exchanging information with the vehicle for safely supervising train circulation. The information exchanged between track and trains can be either continuous or intermittent according to the ERTMS/ETCS level of application and to the nature of the information itself.
Traction Unit | A powered vehicle able to move itself and other vehicles to which it may be coupled.
Train | One or more railway vehicles hauled by one or more traction units, or one traction unit travelling alone, running under a given operational number from an initial fixed point to a terminal fixed point.
Train Data | Defined set of data which gives information about the train. Data that characterises a train and which is acquired by ERTMS/ETCS in order to perform a mission.
Train driver | Person capable and authorised to drive trains, including locomotives, shunting locomotives, work trains, maintenance railway vehicles or trains for the carriage of passengers or goods by rail in an autonomous, responsible and safe manner.
Train Integrity | The level of belief in the train being complete and not having left coaches or wagons behind.
Train Movement | When vehicles are moved with train data available, as a rule from station to station, and as a rule under the authority of proceed aspects from main signals, or similar procedures.
Train Orientation | If there is an active cab, this one defines the orientation of the train, i.e. the side of the active cab is considered as the front of the train. If no cab is active, the train orientation is as when a cab was last active.
Train preparation | Ensuring that a train is in a fit condition to enter service, that the train equipment is correctly deployed and the train composition matches the train’s designated route(s). Train preparation also includes technical inspections carried out prior to the train entering service.
Train Running Number | A unique identifier, consisting of alphanumeric characters, used to designate and track a train during its operation.
Train Trip | Initiated when a train passes an EOA/LOA, excluding any occasion when a suppress facility is used, and causes an immediate application of the emergency brake.
Transitions | The controlled changes between operating modes and / or levels.
Trip Mode | ERTMS/ETCS on-board equipment mode (e.g. entered when passing an EOA), resulting in an application of the emergency brake that can only be revoked at standstill and with additional precautions.
Unfitted Area | A line without operational trackside Automatic Train Protection system.
Unfitted Mode | ERTMS/ETCS on-board equipment mode allowing a fitted train to run in an unfitted area.
Validation | Confirmation by examination and provision of objective evidence that the particular requirements for a specific intended use have been fulfilled.
Virtual Balise Cover | A specific marker in balise telegrams, that allows substituting the physical cover plates in lines under construction.
Warning | Audible and/or visual indication to alert the driver to a condition which requires a positive action by the driver.

Table INT.TER.T1: Terms

Abbreviations | Definition
--- | ---
ACK | Acknowledgement
AD | Automatic Driving mode
ATO | Automatic Train Operation
ATO-OB | Automatic Train Operation – On-Board
ATO-TS | Automatic Train Operation – Trackside
ATP | Automatic Train Protection
BMM | Big Metal Mass
BTM | Balise Transmission Module
CMD | Cold Movement Detection
CSG | Circular Speed Gauge
DAC | Digital Automatic Coupling
DMI | Driver Machine Interface
EIRENE | European Integrated Radio Enhanced Network
EOA | End of Authority
EOLM | End-of-Loop-Marker
ERA | European Union Agency for Railway
ERTMS | European Rail Traffic Management System
ERTMS/ETCS | The ETCS part of ERTMS
ETCS | European Train Control System
ETCS-OB | ETCS On-Board
FRMCS | Future Railway Mobile Communication System
FS | Full Supervision mode
GoA | Grade of Automation
IS | Isolation mode
LOA | Limit of Authority
LRBG | Last Relevant Balise Group
LS | Limited Supervision mode
LSSMA | Lowest Supervised Speed within the Movement Authority
LX | Level crossing
MA | Movement Authority
MRSP | Most Restrictive Speed Profile
NL | Non-Leading mode
NP | No Power mode
NTC | National Train Control
OBU | On-Board Unit
OL | Overlap
OPE | Operation and Traffic Management
OS | On Sight mode
PS | Passive Shunting mode
PT | Post Trip mode
RAP | Roll Away Protection
RBC | Radio Block Centre
RIU | Radio In-fill Unit
RMP | Reverse Movement Protection
RV | Reversing mode
SB | Stand By mode
SBI | Service Brake Intervention supervision limit
SF | System Failure mode
SH | Shunting mode
SL | Sleeping mode
SM | Supervised Manoeuvre mode
SN | National System mode
SoM | Start of Mission
SR | Staff Responsible mode
SRS | System Requirements Specification
SSP | Static Speed Profile
STM | Specific Transmission Module
SvL | Supervised Location
TAF | Track Ahead Free
TPS | Train Protection System
TR | Trip mode
TRK | Trackside
TSI | Technical Specification for Interoperability
TSM | Target Speed Monitoring
TTI | Time to Indication
UN | Unfitted mode
VBC | Virtual Balise Cover

Table INT.TER.T2: Abbreviations

## INT.CODCodification and Symbols (COD)

This document has a modular structure to allow model-specific manuals to reflect the actual ETCS on-board configuration and available options. Each chapter of this document have been codified by 2 or 3 letters taken from the chapter header (e.g. SB for the Stand-By chapter). All the clauses included in the handbook are characterised by the following attributes;

1. Baseline,
2. Operated ETCS system version,
3. ETCS level,
4. DMI screen technology,
5. Type of requirement.

All the clauses within the ETCS driver’s handbook have been be identified by a code identification which is written before each clause. This code provides information about the section from where the clause is included and clause attributes that provides information about the applicability of the clause.

Each clause code has the following structure: TIT.CHA.SEC-[BLS.VER.LEV.LTR.TEC.TYP].N.

Section information | Clauses attributes | Number
TIT - CHA - SEC - | [ BLS . VER . LEV . LTR . TEC . TYP ] | N

Note: BSL, VER, LEV, LTR, TEC and TYP only apply when a specific attribute must indicate a baseline-specific, system version-specific, level-specific, level transition-specific, screen technology-specific or a type of requirement different than “common”, respectively. For every clause, only the non-universally applicable attributes will be included. Therefore, clauses related to universally applicable cases will not include the clause attributes part of the code identification.

Section information:

- TIT: 3 or 2 letters to identify the title of the high level section.
- CHA: 3 or 2 letters to identify the title of the medium level section, if applicable.
- SEC: 3 or 2 letters to identify the title of the low level section, if applicable.

Clause attributes:

- BLS: Baseline. This attribute indicates for which baseline(s) the clause is applicable to. The full baseline code shall be preceded by the letter “B” in order to prevent misunderstanding with the ETCS system version.
- VER: ETCS system version. This attribute indicates for which ETCS system version(s) the clause is applicable to.
- LEV: ETCS level. This attribute indicates for which ETCS level(s) the clause is applicable to. The full level code shall be preceded by the letter “L” in order to prevent misunderstanding with the ETCS system version.
- LTR. This attribute indicates which level transition is relevant to a clause. The full level code shall be preceded by the letter “T” in order to prevent misunderstanding with the ETCS system version.
- TEC: DMI screen technology. This attribute indicates for which type of screen technology the clause is applicable to.
- TYP: Type of requirement. This attribute indicates if a clause is a common, vehicle, network or additional requirement.

Numbering:

N: Number starts at 1 for numbed clauses within the same section information and applicability information.

This characterisation information is useful to produce model-specific manuals but is not relevant information for drivers. The important and safety related clauses for drivers have been marked by warning icons as indicated in Table INT.COD.T1.

Warning icon | Meaning
--- | ---
| Attention icon. This icon highlights clauses that provide relevant information for drivers who must pay special attention to these clauses.
| Safety icon. This icon alerts the driver of a critical situation that can lead to hazardous situation.

Table INT.COD.T1: Warning icon

Note 1: Only the Attention icon has been included in this harmonised handbook. The Safety icon should be added in model-specific manuals to highlight those clauses related to safety according to specific safety evaluation.

Note 2: Dedicated screenshots for Level 0 and Level NTC are not provided; the user should refer to the respective screenshots for Level 1.

## INT.REFReference documents (REF)

[1]
  Subset-023 of CCS TSI 2023 appendix A: Glossary of Terms and Abbreviations. v4.0.0.
[2]
  Subset-026 of CCS TSI 2023 appendix A: System Requirements Specification, version 4.0.0.
[3]
  Subset-026 of CCS TSI 2016 annex A: System Requirements Specification, version 3.6.0.
[4]
  Subset-026 of CCS TSI 2016 annex A: System Requirements Specification, version 3.4.0.
[5]
  ERA_ERTMS_015560 of CCS TSI 2023 appendix A: ETCS Driver Machine Interface, version 4.0.0.
[6]
  ERA_ERTMS_015560 of CCS TSI 2016 annex A: ETCS Driver Machine Interface, version 3.6.0.
[7]
  ERA_ERTMS_015560 of CCS TSI 2016 annex A: ETCS Driver Machine Interface, version 3.4.0.
[8]
  Subset-034 of CCS TSI 2023 appendix A: Train Interface Funcional Interface Specification, version 4.0.0
[9]
  Subset-125 of CCS TSI 2023 appendix A: ERTMS/ATO System Requirements Specification, version 1.0.0
[10
  OPE TSI 2023. Technical Specification for Interoperability relating to the ‘operation and traffic management’ subsystem.
[11]
  LOC & PAS TSI 2023: Technical Specification for Interoperability for Locomotive & Passenger.
[12]
  Subset-153 of CCS TSI 2023 appendix A: Exceptions for on-board reduced envelopes of ETCS system versions, version 0.1.0