I've done basically the same thing (used two wires) with a SWM Niagara.  Only 
difference is; instead of the left track power wire, I connected the chuff 
pickup wire going to the Tsunami in the tender.  In turn, I used the drawbar 
for left track pickup to the loco, and to insure constant power to the loco 
decoder, I installed a "stay alive circuit in the engine.  The motor decoder is 
a heavier rated Lenz.....no 1 amp decoder for the Pitman motor!
Gary Chudzinski


>Michael Eldridge writes:
>Re: Tonite is it! 
>Posted by: "Michael" [email protected]   meldridge2000 
>Fri Mar 18, 2011 12:48 pm (PDT) 
>If you install two decoders, one in the engine and one in the tender, there 
>are two wires between engine and tender, the two track power wires. This is 
>not an >uncommon arrangement in any of the "good" scales like S and P-48, 
>where the Tsunami's don't really have the current specs we'd like for the 
>motor.

>Michael Eldridge



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