Hi Nick,
I don't have any Farish freight wagons, but some time ago I measured a bunch of N-gauge wheelsets, including Farish carriage wheelsets, with a micrometer. My observation was that Farish axlesets are far larger than any other manufacturer's, in axle length and wheel diameter. Here's relevant info I have (all in inches):
Farish BR Mk 3: axle length 0.598, wheeltread diameter 0.250
Farish BR Mk 4: axle length 0.595, wheeltread diameter 0.249
Farish by Bachmann coach axleset: axle length 0.599, wheeltread diameter 0.248
(I replaced my original silver wheels on my IC125 and IC225 coaches with the newer blackened, smaller-flange ones from Farish and Farish by Bachmann, which are interchangeable.)
Tomix TT-03 metal axleset for Tomytec: axle length 0.565, wheeltread diameter 0.220
Fox Valley Models 3602 axleset: axle length 0.560, wheeltread diameter 0.223 (0.225=scale 36" wheel at 1:160)
Doesn't look good for using Farish spoked axlesets on a Tomytec wagon, but I hope this helps!
Rich K.
Thanks Rich, most helpful. I think I'll have to try out for myself. At a pinch I could machine the wheelsets to fit. I still have to check if there is something of the sort in Japan.
Abs NB