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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 SW
The Lionel SW Transformer was produced from 1961 until 1966. It generated 130 Watts of power and would control two trains independently. It has a built-in circuit breaker, however the horn/whistle circuit would operate only one of the trains and there are no directional buttons. There are no variations.