On-board systems

Systems assisting the driver to observe line-side signalling and in cab signalling and thus providing protection of danger points and enforcement of speed limits. On-board TPSs are described as follows: (a)    Warning, providing automatic warning to driver. (b)    Warning and automatic stop, providing automatic warning to driver and automatic stop when passing a signal at danger. (c)     Warning and automatic stop and discrete supervision of speed, providing protection of danger points, where ‘discrete supervision of speed’ means supervision of speed at certain locations (speed traps) at the approach of a signal. (d)    Warning and automatic stop and continuous supervision of speed, providing protection of danger points and continuous supervision of the speed limits of the line, where ‘continuous supervision of speed’ means continuous indication and enforcement of the maximal allowed target speed on all sections of the line. Type (d) is regarded as Automatic Train Protection (ATP) system.