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• Baker valve gear — was the main competitor to Walschaerts valve gear for steam locomotives in the United States. Strictly speaking it was not a valve gear but a variable expansion mechanism adapted to the Walschaerts layout replacing the expansion link and sliding… …   Wikipedia

• Southern valve gear — was briefly popular on steam locomotives in the United States. It combines elements of the Walschaerts and Baker patterns.HistorySouthern valve gear was devised by locomotive designers on the Southern Railway (US) and used on many locomotives on… …   Wikipedia