A friend has asked me to help him diagnose his Bachmann Hand Car. The problem turned out to be no power to the motor except by applying 12 volts directly to the brush holders. However, an attempt to solder the feed wires directly to the brush housings resulted in the plastic piece that holds the brushes melting (see picture - I tried to be quick but the plastic had a melting point about 10 degrees above room temp 
). The motor also had a lot of wear so it doesn’t appear that it would last long - replacing it seems the best approach, if I could find one. Anyone have a suggestion?
David, take a look at this thread, where i used an HO Bachmann motor in a trolley. I suspect it’s the same old Kader 881 motor.
https://largescalecentral.com/t/re-motoring-a-bachmann-4-wheel-trolley/78214
PeterT - I appreciate the suggestion but the Kader 881 appears to be a somewhat different motor. If the replacement motor doesn’t fit the motor carrier, getting a proper gear mesh with both worm gears would appear to be a challenge, particularly considering how fiddly the Hand Car is:
Do you know of a source that has a large selection of hobby size 12v to 18v motors? I may need to build a new drivetrain but not a task I have done very often. Thanks!
I have found motors on eBay, but I wouldn’t call it a wide selection.
My approach would be to look for something smaller in diameter/width, but with long 2mm (?) shafts. You can’t enlarge the carrier, but maybe you can create something to hold the smaller motor.
Another thought would be ?
Then you have extra parts??