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Why do trains sometimes fail to stop at the correct position and not line up with the waiting lines? What procedures are in place when high capacity trains overshoot the platform?

During normal operation, the trains’ signaling computers control acceleration, deceleration, and stopping according to the speed codes received from the wayside. Occasionally, weather conditions, such as rain, may cause the trains to stop at inaccurate positions. This is why our system allows for a ±30cm leeway at either side of the berthing position. Under normal circumstances, trains should berth accurately at the platform marks to let passengers on and off the trains. 

Procedures in the case of a train overshooting the platform are as follows: 

1. If a train overshoots but no door misses the platform: 

The driver informs the OCC, and, after obtaining approval from the OCC, manually opens the doors to let passengers on and off. 

2. If a train overshoots and one to two doors miss the platform: 

The driver informs the OCC, then reverses the train to berth at the correct position to let passengers on and off. Alternatively, the driver may issue a broadcast to inform passengers that the doors will not be opening at the current station, and that passengers for this station need to take a returning train at the next stop. They will then proceed to the next station to let passengers off. 

3. When a train overshoots and three or more doors miss the platform:

(1) The driver informs the OCC and issues a broadcast to inform passengers that the doors will not be opening at the current station, and that passengers for this station need to take a returning train at the next stop. They will then proceed to the next station to let passengers off. 

(2) If overshooting occurs at a terminal or switchback station, or during the last train run of the day, the OCC will instruct the driver to reverse to the correct berthing position.