Here are pictures of the worst offender, a CTR RS3. K-2416-4545 There is a radio, Railsound and RS power board. Also the main power board for the motors. And a smoke unit. The motors are hooked up in parallel currently. There are Prog/Run, SS/RS, Smoke switches and volume control.
A close up of the main power board for the motors.
The right hand plug, Red/black is from the track, Brown/blue go to the motors.
What do I look for as far as momentum or other settings that would prevent wiring the motors in series?