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[quote user="tonis88"] I have recently purchased a Proto 2000 F7A-B set from Walthers but am having problems with consisting. When I put the A and B units into a consist the two units seem to 'see saw' as they move. [/quote] Sounds like you didn't bother to speed match them (or check if they needed it at least).  You can forget all the other remedies posted here if you didn't check for speed matching. I have had matched As & Bs out of the box  (and with identical decoders installed) that ran are wildly different speeds, not to mention even differently in reverse.  I have also had matched sets out ot the box that were pretty close in speed, but never identical. Not only can they be instrinsically very different in speed, but if they are actually preowned, one can have much different cleanliness on the commutator and/or wheels that will cause variations in speed. So before you worry about anything else, learn about speed matching from archived posts and at least give them a speed test.  It is not difficult and is the first essential step in creating a consist. You mentioned that they are new.  It is the usual recommendation that you run each of them (separately, of course) for an hour or more if brand new, to get a little settled in speed-wise.  A loco that is speed matched when brand new, or even one that is already speed matched, will perform much differently each time started up until it hits its broken-in & warmed up speed.  I have just spend a month speed matching more than 40 sets.
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