Errr, don't know. I take it you mean center of front wheel to center of rear wheel for the wheelbase?
I found the following on a website...
Third class and minor railway four wheel coaches were still being built with wheelbases ranging from twelve foot for a four compartment all-third to fifteen foot for a first-third (with two compartments of each). These can be made up using a Peco fifteen foot brake van chassis with a cut-down Graham Farish 'suburban' coach body, with careful cutting you get two four wheeler four compartment bodied from a single Farish coach.
So I naturally assumed this was a standard size coach, hence my request for plans.
Alex
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