ScaleSeven
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ScaleSeven (S7) is a set of finescale model railway standards for 1:43.5 (7 mm scale) using true-to-prototype track and wheel standards. It is principally used to model British standard gauge (4 ft 8-1/2in), Irish Broad Gauge (5 ft 3in), or Great Western broad gauge (7 ft 0-1/4in).