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The description at the bottom of the photo. It describes the "Big Boy" as a "Mallet type". This is incorrect, The Big Boys were simple articulated locomotives with two high pressure engines. They were not Mallet articulated locomotives which had one high pressure engine and one low pressure engine.
The description at the bottom of the photo. It describes the "Big Boy" as a "Mallet type". This is incorrect, The Big Boys were simple articulated locomotives with two high pressure engines. They were not Mallet articulated locomotives which had one high pressure engine and one low pressure engine.