History

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Wales was known for its narrow gauge railways, aparantly they were easier to lay on the tracks up the sides of mountins as they didn't have to excavate as wide a route and most could follow existing paths, also they were cheaper than a conventional sized railway and the radius in the curves could be smaller

See, I didn't know this. You are never too old to learn and I have learned so much here about railroads from all around the world that I had no idea of before.