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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 1041
The Lionel 1041 Transformer was available in 1945 and 1946. It generated 60 Watts of power and would control one train. It does have a built-in circuit breaker and it came with a horn/whistle control. There are no variations.