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7 mm/ft scale
Trinidad Government Railways, Kitson 4-4-0T bogie wheel.

2′ 9½″ diam., 8 rectangular spokes, rectangular inner rim, apparent tread 3½″.
Hub 9½″ face dia., 1½″ out from the wheel. (Some dimensions are estimated from photos)

Casting: 19.5 tread dia., 15.5 i/d., hub 0.6 mm out from the tyre.

Casting prices and stock . Trinidad loco sets, price list

Scan of a casting in a set for Trinidad 4-4-0T, early, Trinidad 4-4-0T, later.

Scan of casting B446

Cross section diagram of casting B446
This example shows a tyre width of 3.5 mm for Gauge 0 Fine.
For Scale7 remove more metal from the back of the wheel to give a tyre thickness of 3.2 mm instead of 3.5 mm.

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10 July 2021