The railbus is only powered on a single axle - this should be more than sufficient for a tiny rail vehicle that will never pull anything. The gearbox folds up and is soldered to the chassis plate.A little open frame motor screws into place and then wheels ans gears are fitted. The last owner strengthened some of the bends with fillets of solder, not a bad idea as the brass is pretty thin.
The gears don't have grub screws to retain them. On the axle a dollop of superglue does the job (Loctite would be more engineeringly but I don't get on with it) and the worm pushes on to the motor shaft without fixative.
The result seems to work OK., Top speed doesn't seem too mad but I'll get a better idea once the other wheels are in.
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