I agree David that the notable Welsh NG railways were all sub 2ft. I also agree that a suitable source of bull/double headed rail may be a challenge. I know Paul H used S Scale Society rail for Dinas but seem to recall hearing the latest rail is not so good.
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However, the real opportunity with the Templot approach is that ALL the track and pointwork for a layout can be printed with correct chairs and sleepering in your chosen gauge. There are even 3d printable filing jugs for the rails. It is a completely opposite approach to buying some flexible track and a few points and assembling a track plan. That said it is mightily difficult to perfect a complete digital plan. I resorted to full size paper for the crossover and goods yard loop for Lynton. And the PLR was all done with hand drawn templates.
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John
