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Chapter 2. Concepts for Safe Railway Operation and Control
2.2.3.7. Stand By
The Stand By (SB) [88, p. 14] Mode is the default mode after starting the ETCS on-board
equipment. In this mode, a self-test and a test of all external devices is executed. ETCS
supervises that the train does not move at all.
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2.2.3.8. Trip
In the Trip (TR) [88, p. 23] Mode, the emergency brake is active until the train completely
stops and the conductor acknowledges the Trip. This changes the ETCS operational state to
Post Trip (Subsection 2.2.3.9).
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2.2.3.9. Post Trip
The Post Trip (PT) [88, pp. 24-25] Mode is entered, when the train conductor acknowledges a
Trip after an emergency stop, which then releases the breaks. In Post Trip, it is possible that
the train drives a certain distance (defined by a national value) backwards. Only this distance
is supervised in this mode by ETCS.
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2.2.3.10. System Failure
In case of an error in the ETCS on-board equipment that leads to an failure of the system
the on-board equipment should switch to System Failure (SF) [88, p. 11]. In this Mode, the
emergency braking should be permanently active.
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2.2.3.11. Isolation
The Isolation (IS) [88, p. 9] Mode should be used if the EVC is isolated from the other on-board
equipment (including the driver) and is also physically isolated from the brake systems. In this
Mode, the ETCS on-board equipment does not have any responsibility.
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2.2.3.12. No Power
The No Power (NP) [88, p. 10] Mode should be used if the ETCS on-board equipment is
switched off.
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