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This Identification Guide for Lionel Electric Trains covers the "Post-war Era" only from 1945 until 1969.
LIONEL TRAINS SUPER-O POWER BUSS CONNECTOR No. 31-45
Super-O Power Buss Connector No. 31-45 replaced the No. 31-7 in 1961 and was available until 1966. There is no difference between these two track accessories except the quantity that was enclosed and the number changed on the envelope.
Like its predecessor, the power blade contents are common. It is the envelope that is collectable. These connectors were used to join the center power rails between sections of Super-O tracks.
There are no variations.