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Having the same problem with 2 of my older 2 rail locos.  Same behavior on my track or when running directly from my MRC Control Master 20 Power Center (video).  These two engines will run a few inches, then seem to short, then run a bit more. Repeat, Repeat.  They run better below 3 volts, very slow.  Going above that will ensure this stop/start action.

They are not binding, but in the case of the video below I can see some small sparking and occasionally a small wisp of smoke.  Anything I can change?  Wondering if they maybe need to be repowered.

Not sure of the make of this one, but the other is a mid-80's Sunset 4-6-2.  Since the track can be ruled out, I think it's either the engines (which seems peculiar since it is not just one loco) or possibly the power pack.  Could that be?

Any suggestions would be appreciated, except to mount these on the wall forever.  They need to run.

Thanks,

Eric

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Do you have any other power sources?  That sure looks like an All Nation engine and the open frame motor in it may just be drawing too much current for your throttle.  It might be going into current limit which could cause the start/stop.  It doesn't seem like dirty wheels or track is the only reason since it does it with the power source directly connected to the engine.

Control Power 20 may be a 2 amp power supply.     If that is the case, it may be as mentioned above, the power supply is not quite capable of running these locos.    Many of the older locos draw 2 amps or a little more.     Cleaning and lubing the motors so all runs freely does help reduce the load a little but probably enough.

That behavior certainly seems like the breaker on the power may be going in and out.

The locos would draw a bit more under load also.

@prrjim posted:

Control Power 20 may be a 2 amp power supply.     If that is the case, it may be as mentioned above, the power supply is not quite capable of running these locos.    Many of the older locos draw 2 amps or a little more.     Cleaning and lubing the motors so all runs freely does help reduce the load a little but probably enough.

That behavior certainly seems like the breaker on the power may be going in and out.

The locos would draw a bit more under load also.

Just checked to confirm, there are several of the MRC Control  Master  (not  "power")  20 power packs on my RR and each one is listed as 56 VA in the 0-14 volt DC  range.

Last edited by Tom Tee

I opened it up and pulled the motor. Cleaned the commutator and brushes. Applied power directly to the brushes and the motor turned then stopped. Same behavior as when mounted in the chassis.

I've ruled out track, dirt, and power source I believe.  Think I'll send it off to a pro. Any suggestions?  I like the old motors, but am open to a can. Just don't know what would fit.

PUt a meter in line with the motor and try it to see what amperage it is drawing.    There is an off chance that the breaker in the power supply is going off at too low an amperage.    The behavior you describe sounds just like an overload.     Does the power supply have a short indicator?    And does it come on when the motor stops?     If the amperage goes way up, over 4.5 or so, it is probably the motor.   If the breaker trips at 2 amps or so, then the power supply breaker might have an issue.    56 VA should give you more than 4 amps at 12 Volts if all on same throttle.

If all your other stuff is newer (2000s) give or take, they might draw less than 2 amps and the breaker may ignore them.

Last edited by prrjim

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