Union Pacific Steam Engine # 9000 - Only one type of this 4-12-2 steam engine was built: the Union Pacific Railroad's 9000-series or class of locomotives. ALCO had obtained permission to use the conjugated valve gear invented by Sir Nigel Gresley. This sy

Union Pacific Steam ...

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转采于2019-04-01 09:30:06

Union Pacific Steam Engine # 9000 - Only one type of this 4-12-2 steam engine was built: the Union Pacific Railroad's 9000-series or class of locomotives. ALCO had obtained permission to use the conjugated valve gear invented by Sir Nigel Gresley. This sy

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