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Normally I would suggest cleaning the wheels and the track first, before anything else. These things are always important in assisting good, reliable running.

However, what is obvious from your videos is that the power is getting into the locomotive, because the lights are coming on even though there is no movement. That means the motor or gear train are sticking. Now, I don't know the Mantua mechanism details at all, but in general, freeing up these things involves a bit of dismantling and cleaning any grease or dried oil off, then relubricating with a small amount of suitable light oil. Also, lightly oil the axles in their bearings.

Depending on the motor type, the brushes may need attention as well. There is little you can do with an enclosed can motor, but if it is an open frame motor you may be able to see whether the brushes are worn or not bedded in, depending on how much running this locomotive has had.

As I said, I don't know the Mantua set up at all, so my suggestions are, of necessity, rather generic.

I recently bought a second-hand Pennsy GG1 electric, made, I think, by Mehano for an American firm. It had motors and flywheels at both ends, but on test I found one end was seized solid. That didn't worry me too much as I wanted it mainly for display, but I had a look at it anyway, and ended up dismantling the gearbox and gear tower completely at the seized end. What I found was that the original oil had turned into a very solid glue, and the owrm shaft at the top would not turn at all. I soaked all the gears and shafts in Isopropyl Alcohol, before reassembling it and oiling it. I decided to clean and oil the mechanism at the other end as well, then ran it again on DC, and it ran very sweetly indeed. Not bad for my $AUS40 purchase.
 
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