Hi Thomas. Welcome aboard! ?Basically we aim to model in 7mm scale with a near correct track gauge. ?So 14mm is exactly 2’ gauge but gets used for everything from Penrhyn 1’10 3/4” through to 2’0”. ?Not Talyllyn at 2’3”.?
Personally I use everything and anything available for 7mm Narrow gauge and build it to?run on 14mm gauge track. Good resources from the 7mm Narrow gauge Association and a good list of suppliers on their website for members.?
Remember it is very much a model builders option. Not really any RTR stuff nor RTR chasses but we source bits and pieces from all over the place. Some things are quite easy; my Lyd model is from the ancient Gibson/Link kit built pretty much as intended but with the wheels set to the narrower back to back. As it’s outside framed a few washers on the axle is all that’s required. But if you want to build a kit and stick it on an RTR chassis, then stick with mainstream O-16.5.?
Good luck. It’s fun in here.?
Paul?
Paul Holmes