I bought a Tramfabreik 'Farish (Poole) Class 37 Conversion kit' which arrived yesterday. I have a 1981-vintage 37 which is really noisy, but runs well with the 3-pole motor until it gets hot, it also has issues with a slipping drive dog at one end! It does, however, have brass gears which do not/will not split! The fitting instructions online omitted the fact that the early Farish 37s had the motor pole pieces RIVETTED to the chassis - that took a bit of sorting out. I managed to remove the bit of metal around the lower brush housing and the corresponding upper plastic one without using the end mill they recommend. The new motor fits a treat and was easy to join to the worm drive shafts using the silicone tube provided (I used a 9mm length at one end and 10mm at the other). I soldered really tiny (but flexible) wires (about 3" long) to the motor and ran them up to the top plate. I didn't solder the wires at the top end - I used Poole's 'technique' of squeezing the wires under a relevent screw head! A test run without the body on showed it runs really slow and quiet. It's a little noisier with the body back on but it runs very nice, plodding around at about a scale 35mph. It appears on a YouTube video I made today, too. Search YouTube with 'Walsall N Gauge' then look for 'A final look at WL102...'.