The attached table of British NG rail and sleeper sizes (PDF) shows the main (flat bottom) rail weights and sleeper sizes and spacing for some of the principle British narrow gauge railways at various stages of their existence.
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Users of Templot may be interested in obtaining two templates for prototype turnouts as follows:
The first turnout is based on the drawing of a Robert Hudson 6′ 1 in 6 turnout as published with the track articles in issues 63-65 in the NG&IRM Review and also available on this site as a PDF.
The second turnout [...]
Narrow Gauge & Industrial Railway Modelling Review issues 63, 64 & 65 featured a series of articles by John Clutterbuck on building finescale 7mm narrow gauge track. This included a template to aid construction of a Robert Hudson 1 in 6 turnout template in O14 which is included here for group members personal use: O14 [...]