I purchased a Lionel 6-13900 Standard Gauge 200 trolley. Probably from early 1990's, it is a reissue of the original #200. I find that it goes way too fast and hops through new MTH switches. (drive gear sits very low on wheel). Has anyone tried to re-power them? I have seen on this forum people have used the G scale USA trains R22-12B. Has anyone done this with this trolley? or any other motor?
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A small "Fat Wheel" like old Marx O 
The fat wheel is a limiting factor for running Marx on Lionel turnouts too. You might find that keeping that fat wheel with the gear oriented so it passes only along the unbroken long straight of turnouts, and doesn't turn into the track deviation, is the best way to run it as is.
Too fast at near stall? Or just too sensitive to the throttle position?
Because you might also try a diode string or bridge rectifier to knock a few volts off the throttles position. Each one knocks off about 1.5v.
You'll likely need the diodes or rectifier to convert a DC motor to AC anyhow.
(ac motors on dc is usually fine. Its dc motors on ac supplies that burn up without rectification)
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