An Intermediate Signal is best described as which of the following?

Answer: B — A block signal equipped with a number plate, a G marker, or a P marker that conveys Restricted Proceed as the most restrictive aspect

An intermediate signal is a block signal placed inside a block that carries extra identifying markers to show a specific restricted aspect. The number plate, G marker, or P marker on such a signal indicates that the aspect shown is Restricted Proceed—the most restrictive movement allowed within that block. This alerts the engineer to proceed with caution and at a reduced speed, being prepared to stop at the next signal if the block ahead isn’t clear. This isn’t simply a fixed green lamp, which would be a basic main signal, nor a distant signal with a white light, which serves a different purpose about the following block. It also isn’t a turnout position indicator, which shows where a turnout is set rather than the signal’s movement authority.