@jini5 posted:I have removed the motor from the rear truck and that smoothed everyting out. However, That is not really a fix in my opinion. I feel I am taking away value of the product by removing a motor. I even went as far as purchasing another motor from MTH. That motor made no difference. As a matter of fact, the new motor seemed to make things worse. I reinstalled the original motor. As I posted above, I can even get single locos to the "bucking".
@jini5 I had exactly the same experience with my first and only MTH A-B-A set. "Run smoothly at 2 scale mph" my butt!! (At the time, MTH tech support told me that performance was "within specs." They eventually changed their catalog copy to "runs smoothly 5 scale mph.") There really is no other solution. I still have my FT's, but after that I switched to Lionel with the back-drivable gears. In the early 2000s Lionel had its own struggles with the "Odyssey lurch." But they learned from the issue and engineered an effective solution instead of milking a cash cow.
I'm not a DCS expert and my DCS set is packed away right now. It's definitely possible to turn the cruise control off. Either browse the menu options on your remote, or check the manual. I'm sure it's mentioned in Barry Broskowitz's guide to DCS, if you have that.
By "turning around," what I meant was to put the loco with the tach reader motor end closest to the train. I guess if the tach reader is on the rear motor, you could try pulling the train with only that unit, just to see if it still bucks. I would like to know if the root cause is mechanical, or a timing "feedback loop" caused by the speed control.
