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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 S
The Lionel Type S Transformer was only available in 1947. It was cataloged as producing 75 Watts, but in reality it produced 80 Watts, and the instruction sheet dated 8-47 confirms this wattage. Producing 6-24 volts on its primary variable circuit, this transformer also has a built-in whistle and directional control. There are no variations.
A difficult transformer to find in good condition.