Last year I bought a Bachmann Railking starter set, product #00657, in HO scale.  It has worked great and I have really enjoyed it.  This year for my birthday, I bought a Spectrum Series J Class 611 Steam locomotive, product #82122, with DCC on board.  When I try to run this locomotive on the Railking set, the performance is terrible.  The locomotive barely pulls forward, much less adding a train to it.  Moving backwards is only slightly better.  Is the Spectrum Locomotive compatable with the starter speed control in the Railking set, or does it sound like there may be a problem with the the locomotive?  If anyone can help, I would appreciate the advice.  Thanks.