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This is a 23 foot post with mountings for 2 signal arms. The 23' signal post can be either a main line or loop signal. Signal post heights indicated the status of the track they were protecting. Similarly, signal arm placements and sizes followed the same rule.
A set of detail parts containing signal arms and other details such as finials, lamp tops and counterweight levers is also required to complete this signal along with 0.015" phosphor bronze wire and several small screws that are readily available.