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One thing to check: does the drivetrain roll freely? This could be something as simple as a piece of flash rubbing in the gearing somewhere. Also worth checking is that everything is where it should be - I have a Bachmann N F7 which had a similar problem (ran slowly and got hot), until I discovered that the factory had bodged the truck assembly so one of the pickups was mangled and not in the right place. A few minutes work with some flat-jawed pliers solved this problem (removed pickup, straightened it, re-fitted it). From what you're saying I'm wondering if the loco is slowly jamming up (which would trip the overload circuit in the power unit) then moving off again when this resets. Try putting both locos on the track at the same time (not coupled together) and see if the older one is affected by the new one - if my theory is correct it will stop at the same time as the new one. <br /> <br />Best advice I can give would be to get in touch with Bachmann - if it's motor-related then curing it could be very tricky, and if it's a brand new loco then you should be able to return it under guarantee - Bachmann's service department are very good by most accounts. Hope this helps!
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