# Sleeping (SL)

SL.1The Sleeping (SL) mode is used to manage the ETCS on-board equipment of a slave engine when it is remote controlled.

Since there is no driver, no information is shown on the desk(s) of the sleeping engine. For this reason, the desk(s) of the sleeping engine must remain closed.

The notion of responsibility of the driver is not relevant for this mode.

In Sleeping mode, the leading engine is responsible for the movement of the train.

SL.2The following mode transitions can be triggered from SL mode:

1. NP mode. Transition triggered when the ETCS on-board is powered off as indicated in section OFF.PWR Power off the ETCS on-board (PWR)).
2. SB mode. Transition triggered when the desk of the sleeping engine is opened while the train is running (see section SB.OPN Open the desk (OPN)).
3. IS mode. Transition triggered when the driver isolates the ETCS on-board equipment (see section IS.ENT Entering Isolation mode (ENT)).