Wow...? I'm not a loco builder but (coincidentally) this plastic model of the 'Flying Scotsman' came as part of a recent auction lot. It says that it's 1:220 scale, which I guess is Z (or near).
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I'm tempted to get some track and make a little diorama with it... it came with two (long) carriages.
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(Sorry purists, plastic is pretty rubbish!)
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