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The Semaphore Signal No. 151 during its first year of production would have a GREEN base (Variation D). Produced from 1947 until the end of the post-war period in 1969, it would normally have a BLACK base.

When the weight of a passing train activated the 145C Contact the arm would move 90 degrees and show a RED aspect signal.

Other variations include a version that had the post made out of aluminum instead of SILVER painted sheet metal, and a variation that would have the blade painted RED.

Dimensions:

Height: 9-7/8 inches to the tip of the blade
Base: 4 inches long, 1-3/4 inches wide.
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