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***Because when the end bearings have too much slop, the weight of the loco going down hill forces the end of the shaft to move, changing the way the worms relate to the gears, creating a greater pressure, lesser pressure effect on the drivetrain.

This varies the motor load so it varies the back EMF it emits in a more/less/more/less cycle, creating the juddering effect.


Would this be the case in an upwards incline also
one of the class 37's starts up the incline here with a judder then half way up settles.
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