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7 mm/ft scale
Highland Railway tender wheels

3′ 9½″ diam. 10 rectangular spokes, apparent tread 4″.
Hub 14″ face dia., level with the tyre.

Source: Sharpe Stewart works drawing.

Casting: 26.5 tread dia., 21.9 i/d., hub level with the tyre.

Casting prices and stock . HR loco sets, price list

Scan of a casting in sets for a HR 4-4-0 Loch . HR 4-4-0 Skye Bogie

Scan of casting B56

Cross section diagram of casting B56
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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27 Mar 2013