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Would it be possible to aquire a higher speed motor of similar size?  If this was a larger locomotive I would suggest a possible step up gearing (add a large gear on motor shaft, meshing with a small gear on the worm shaft) to give an increase in speed, but I doubt you have space in an IM F unit for that.  My guess is IM assumes most customers will either run on layouts in a smaller space or run freights with Fs. And a similar experiance with unsatisfactory top speeds: I was at a hobby shop near Boston, MA a couple years ago and was looking at buying a Bachmann Spectrum J.  Fortuneately for me the guy working the HO scale counter (they have separate counters for different scales, have to segregate the 3 rail folks from 2 rail, otherwise you end up with arguments and name calling!) volunteered to run it on their 10ft test track.  Time from one end to the other: >20 sec at max throttle setting.  He could tell that I was no longer interested in purchasing it and boxed it back up and set it in a cardboard box on the floor behind the counter for shipment back to Bachmann.  Edit: NWSL has one that spins at 12,500rpm.  Dont know what IM uses.  Available on walthers for $25.
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