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The difference between a 1:29 and a 1:32 scale loco is 10 percent in each of the 3 dimensions, so the 1:29 is 10% longer, 10% wider and 10% taller, but those values MULTIPLY when VOLUME is considered so the 1:29 loco is 30% bigger than the 1:32. If they are models of the same or similar units the difference is very noticeable to some people. If they are models of very different prototypes, the scale difference can be visually nil.
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