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Reply to "Wiring Question on a 2203B/2403B/6403B tender"

Something I have run across before is that the prewar locos connected center rail power between the engine and the tender.  In post war locos the loco to tender jumper wire is outside rail power.  I believe this change is because the post war 0-4-0 wheel arrangement was too short to guarantee outside rail contact through some track work.  Unfortunately, I do not have access to enough prewar 201 and 203 locos to verify this with multiple observations.  On the 227 family of prewar 0-6-0  locos, it is clear that this the case.  The plug in the cab of the loco is part of the brush plate and is directly connected to the switch that turns the e-unit on and off.


I believe that Dennis’s very nice drawing, above, is for a postwar tender, 2403B and 6403B, which have the second engine to tender jumper wire as a outside rail connection.  For the 2203B prewar tender the jumper wire is a center rail jumper and the black wire should connect to one of the eyelets on the other side of the lamp socket, connecting it to the red wire.

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