Hi Jim

It works very smooth in DC. At first I thought it might be poor electrical pickup in the trucks but DC mode works OK.

Hi Jim

What decoder for a diesel would you recommend? And what are the challenges to synchronize the sound with the movement of the loco?

I have just installed a Bachmann decoder in an Athearn GP9 chassis. The motor is all nicely insulated from the chassis, the correct wires are connected to the decoder and the black wire is tightly grounded to the chassis. However when I run it the engine is jerky at start up or does not start at all unless I give it a little push. When it get rolling it runs very smooth. I ran the motor in DCC mode before I pushed it back into the chassis and it worked fine. It also runs OK when I put it on a DC track and starts up very nice.

Any suggestions?

Thanks