What is the difference between a stop signal and a permissive signal?

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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Those with a square end are absolute signals and generally force trains to stop when in their most restrictive position. Those with a pointed end are permissive signals and permit a train to continue at a significantly lower speed rather than having to come to a complete stop.

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An analog signal is a continuous function, whereas a digital signal is a discontinuous function. Typically speaking, analog and digital signals are two signal kinds that carry data or information.

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Single yellow means you can pass your train this signal and be prepare to see the next signal , which is not yet clear. And double yellow means the you can pass this signal with your maximum permissible speed , as the next signal is also clear.

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Facing or trailing are railway turnouts (or 'points' in the UK) in respect to whether they are divergent or convergent. When a train traverses a turnout in a facing direction, it may diverge onto either of the two routes. When travelled in a trailing direction, the two routes converge onto each other.

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The rearlights on locomotives, multiple units and railcars. To ensure that the rear of the failed train is always visible, all trains are required to display three red lights at their rear: two tail lamps plus the red portion of the destination roller blind.

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