the drive on the Selkirk is the belt drive from the motor geared to belt to the gear on the lower drive shaft which rides in a ball bearing in the rear to the ball bearing gearbox on the driver. The problem is the belt not handling the torque the big pittman motor driving a big 1-10-4 steamer that pulls a 12 car passenger car and a poor quality set screw on the flywheel. I have older 3rd rail engines that have the universal drive system and are still running great. In fact I have 24 of them, 3rd rail, lionel, mth, weaver Williams and the only belt drive I have is the Selkirk. I even have to pay for the defective parts from sunset 3rd rail.
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