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Peter,

Sounds like the white wire is a ground wire.. This would be used for noise suppression of the motor.. I would save it, but I do not think you will need it with the DCC decoder.. I would also install the decoder in the loco, that way you have 2 wires for the rear lite, 2 wires for the speaker & 2 wires for track power to the loco.. That way you can add cab lites & smoke control with out extra wires between the tender & loco..

BulletBob

PS Looking forward to the pictures of the install..
 
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