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How much pressure is in the boiler of a steam locomotive?

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The pressure (along with mechanical advantages from leverage and gearing) determined the locomotive's ability to move weight and to move at speed. Boiler steam presses against a piston rod that pushes (via levers and rods and cams) the rim of the drive wheel(s). read more

A high-pressure steam locomotive is a steam locomotive with a boiler that operates at pressures well above what would be considered normal. In the later years of steam, boiler pressures were typically 200 to 250 psi (1.38 to 1.72 MPa). read more

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