What is a stop signal train?

Stop signals A stop signal has a red arm with vertical white stripe towards the left-hand end. It shows a red light when on and a green light when off. Trains must not pass stop signals when on except under specially authorised conditions – this is one of the most contentious issues of modern-day railway operation.



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Permissive signals only provide protection. Absolute signals provide both control and protection. Functionally, the basic difference between permissive and absolute signals is the most restrictive type of indication each can display. A red permissive signal means stop and proceed.

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1. Semaphore Signals. The semaphore was the first railroad signal to use electricity. The original semaphores used a two-position arm/blade to alert train operators if they must stop and stay (horizontal position), or could stop and proceed with caution (vertical position).

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The railways use a train detection systems which can tell signallers exactly where every train is and how fast they are going. There are also systems that can automatically stop trains if the driver doesn't take the correct course of action or passes through a red signal.

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A low-voltage electric current is sent between the two rails via a series of relays like the ones in this photo. When a train approaches, the current runs through the train's metal wheels and axles instead of the relays. This short circuit activates the crossing signal.

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Most trains do not know where they are or where to to stop. A few are operated automatically, but most have a DRIVER. It is the driver who knows where the train is and where to stop.

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