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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 1037
The Lionel 1037 Transformer was available in 1946 and 1947. It generated 40 Watts of power and would control one train. It does not have a built-in circuit breaker nor did it come with a horn/whistle circuit. There are no variations.