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This Identification Guide for Lionel Electric Trains covers the "Post-war Era" only from 1945 until 1969.
LIONEL TRAINS TRANSFORMER TYPE LW
The Lionel LW Transformer was available from 1955 until 1966. It generated 125 Watts of power and would control one train. It has a built-in circuit breaker, and buttons that control the direction of the train and the horn/whistle circuit. There are no variations.