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This is a 27 foot Distant post. The 27' Distant signal is a main line signal placed some distance from the Home signal of a station or other interlocking. The signal post has a green light above the Distant arm to indicate that the signal could be passed if the Distant arm was at stop. The Distant arm at stop showed that the Home signal ahead was at stop. Green over Red equals Caution.
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.