Weird TMCC problem

Sounds like the flywheel magnet ring is in pieces. That will effect the speed control. At first I thought the TMCC base may not be pugged into a proper ground outlet. But other engines run fine. Just odd that both engines developed this problem sitting on a shelf

Dave is correct, that's the likely issue.  If you open them up and the ring is still intact but the adhesive has dried and it's not in place, you can glue it back in place.  If the magnet ring has already self-destructed, then you will need a new magnet ring, that's a bit more work.

The ring is dirt cheap at $1.50, but in order to use it, you have to pull the flywheel, glue the ring on, and replace the flywheel.  There is also a replacement flywheel with a setscrew that eliminates the replacement of the original and makes the task a bit easier, that's $9.50.

If you have a wheel/flywheel puller, you can actually use the replacement flywheel and magnet without removing the motor.  However, if you opt to use the original flywheel and replace the magnet, then you must remove the motor to press the flywheel back on as you have to support the motor axle at the worm to avoid damaging the motor pressing the flywheel on.

Finally, the replacement flywheel and magnet don't fit that well together, so it's a bit tricky to get the magnet glued to the flywheel as you have to add some spacers to center it while gluing, don't know what Lionel was thinking...

sorry I didn’t back earlier.  Thanks for the feedback.  I will check them out.  I hear some rattling in one of them.

@What'sUpDoc? posted:

I hear some rattling in one of them.

Probably the remnants of your flywheel magnet.