Steam locomotive profile: 2-6-6-4

Seaboard Air Line twin smokestack 2-6-6-4
During the latter half of the 1920s the single expansion articulated locomotive had evolved into a very capable machine. It could lug a heavy train over mountain grades, and in flat terrain it could run at the same speed as a 2-8-2. But railroad lo...

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STEAM LOCOMOTIVES

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