Diagrams Index . Home
1:22.6, Gauge 3
X39, X40
LNER 4-6-2 A1/A3, B17 driving wheels

6′ 8″ diam., 20 spokes, rectangular inner rim, apparent tread 4¾″, tyre thickness 5⅜″.
Hub 21″ face dia., pin between at 13″, hub is level with the tyre.

Sources: No 4472 measured direct at Llangollen in Feb. 1995.
O.S. Noch, British Locomotives of the 20th Century, vol. 1: page 219, detailed works drawings.

Casting: 89.9 tread dia., 79.3 mm i/d, hub level with the tyre, pin at 14.6 mm.

Gauge 3 loco set prices . Casting prices and stock

Scan of a casting in sets for LNER Gresley A1/A3 .

Suitable for the Gauge 3 Society 2010 minimum tyre width of 6.8 mm, or the earlier standard of 8.0 mm.

Scan of casting X39
Scan of casting X40

Cross section diagram of castings X39 and X40

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27 Mar 2013