I bought a new MTH Aerotrain (the set with passenger cars) in March. I operate all my trains in DCC. Now the aerotrain is in the railking line. I usually by the premier line. The railking line doesn't have a DCC/DCS switch so to operate this loco in DCC I had to clip a gray wire per the instructions. No big deal I've installed DCC decoders many times. When I went to operate the train it immediately goes to full speed as soon as I touch the throttle, it has no other speed and I have no control with the throttle. Thoughts? I'm doubting this is a DCC problem.