New Dreyfus Hudson J3 runaway

[tscroz]

I have a brand new Bachmann Dreyfus Hudson loco with TSC sound decoder i got from Trainz and when i put it on my track it immediately starts to run. I cannot control it with my NCE PowerCab. I can use the Horn Whistle and Headlight buttons and they work, but with speed zero set, it just runs on the track at about speed 8-10 until i remove track power. It does not respond to any speed command, nor E-stop. I have tried changing the address (while it's running) and it will stop briefly to respond, but then starts again.
Any ideas? Other locos/decoders work fine.