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AN INTRODUCTION TO - page 69 / 72

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Fig 8 - The third train arrives

The signalman has another choice to make. He can cancel the route set up for Train 6460, wait for it to "release" and then set up the route for 6458 to run into the platform or he can wait for the original move of 6460 to be completed.

If he cancels the route for 6460, the signalman must wait for it to "release" before another route can be set up. A release is an electronic timer usually set for two minutes. This is to ensure that no train moves on to a track circuit immediately after the signal has returned to red. This could happen if a driver sees a proceed aspect and starts his train, only to see the signal return to danger and finds he cannot stop before occupying the route.

The Next Move Begins

Now, at last in Fig 9, Train 6460 has begun to move. The signalman had phoned the platform staff to see what was holding up 6460 and was told they had trouble clearing the train. Someone didn’t want to get off but it’s now OK after they were told the police were to be called and the train will move.

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