First, if you have a lighted car, run it around the layout and watch for any dimming of the light to indicate a bad section. If you have no lighted car, use a voltmeter to check for any voltage drops around the layout. Is the track clean of dirt and rust? Are the track pins clean and tight? Any drop indicates a bad connection somewhere.

Your problem may be due to a need of service to your rolling stock.
Has the 736 been serviced to clean and lubricate the motor, gears and bearings, and the rolling stock bearings lubricated?

After these items are taken care of, your trains should run properly.


Larry