The Highland Railway’s Clan Class was a class of passenger 4-6-0 steam locomotives designed by Christopher Cumming. The design is derived from that of the slightly earlier Clan Goods although the similarity is more visual than real.They had 21-by-26-inch (533 by 660 mm) cylinders outside with outside Walschaerts valve gear 6 ft 0 in (1.83 m) driving wheels and a boiler pressured to 175 lbf/in² (1.2 MPa).
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