Chuck Harrington has posted copies of all the Flyer factory repair paper at his site: myflyertrains.org and, in particular, if you look here: http://myflyertrains.org/gallery/album211 you will see several pages on the 18B and 30B transformers and their wiring diagram. Its a bit hard to tell, but I'm fairly certain the two little "bumps" above and below the red 'bulbs' in the circuit diagram are the circuit breakers - so that should give you an idea about how they are wired into the circuit.
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