Hello Adrian and others,
Sorry for going off topic, but while I can't help you with a 3 cylinder NG loco, the Tasmanian Government Railways had two 8 cylinder Garratts, provided you're prepared to accept that 3'6" is narrow gauge. They were, I believe, the only 8 cylinder ones ever built. ?
Their classification was?the?M class, wheel arrangement?4-4-2 + 2-4-4, with 4 cylinders at each end.? I've never seen a model of one, and I guess it only adds,?with the TGR K class, to Tassie having had some of the weirdest?Garratts built. ??
Regards
Ian Johnston