American Flyer Transformers 19B & 20BW Instructions
Attached is the American Flyer Train Transformer installation and wiring instructions for the American Flyer Transformer Type 20B.
If the Transformer has B in the name (ie. 1.5B vs. 1.5) it means the transformer came with a Circuit Breaker. If you wanted you could also use a Catalog #13 which was connected between the transformer and between the track and you could add a circuit breaker to prevent a fire from a short or transformer problem.