The correct answer is: A. Colour light distance.
A P marker is a type of railway signal that is used to indicate the distance to the next colour light signal. It is a white post with a red band at the top, and it is located on the right-hand side of the track. The P marker is usually located 1,000 feet (305 metres) from the next colour light signal, but this distance may vary depending on the specific railway line.
A semaphore distant signal is a type of railway signal that is used to indicate the distance to the next semaphore signal. It is a red and white post with a semaphore arm that can be in either the up or down position. The semaphore distant signal is usually located 1,500 feet (457 metres) from the next semaphore signal.
A semaphore warner signal is a type of railway signal that is used to warn train drivers of a potential hazard ahead. It is a red and white post with a semaphore arm that can be in either the up or
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