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First of all the decoders. The DH163 is not the same as the DH123. The 163 has a feature called scaleable speed stabilization which tries to keep the loco at a constant speed as it goes up and down grades. This feature is controlled in CV's 55, 56 and 57. I have both 163's and 123's and do not MU with these different decoders. Confusing - I MU 123's together and MU 163's together -- I do not MU a 163 with a 123. In theory you should be able to power both locos from a single decoder as long as you don't exceed the 1.5 amp decoder limit. Remember the stall voltage on a loco can be significantly higher than the normal running voltage. Although your P2K locos combined run well under the 1.5 amp limit, I'm not sure they wouldn't exceed the stall voltage. I believe stall voltage is measured when a running locomotive is made to stall --- holding it down with your hand will do it. When Model Railroader publishes product reviews, they list the stall voltage. You may find what your looking for in an old review.
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