Earl Carins

Hello "Back Cab" If it where me having this problem, i think i would tackle it in this way. 1) remove the body to expose the inner workings, 2) before doing any more check all the electrical connections are sound, if there not, put them right at this stage, if alls ok 3) remove the motor from the body, then check that the chassis will run along the track freely by gently pushing it, check for any tight spots, it may need oiling or even a good cleaning, if alls well 4) try to run the motor out of the loco to see how it performs, its should run warm but not hot, if its running hot the motor could be faulty.
Good Luck.....

Hmmmmm...,sounds as if the armature may have burnt out ,but...

The common fault with these ex-Dapol locos is that the brush springs lose their tension,and so the brushes sieze in their guides -causing very erratic running,strip the motor down,degrease,check that the armature hasn't burnt out,and re-assemble making sure the brushes slide ok,the springs can be stretched out if neccesary,or replaced...