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Little History:
The first 28 ''Mountains'' on the Southern Pacific Lines were built by the American Locomotive Company and were delivered during 1923 and 1924. These locomotives were designated Class Mt-1 and assigned road numbers 4300 through 4327. They had 28 x 30 cylinders, 73" drivers, a 210 psi boiler pressure, a tractive effort of 57,510 lbs and weighed 368,000 pounds. Later, in 1924 another six ''Mountains'' were delivered from ALCO. These six (road numbers 4385 through 4390) were designated Class Mt-2 and were similar to the Class Mt-1s, but had a 225 psi boiler pressure and a tractive effort of 61,620 pounds.
The first 28 ''Mountains'' on the Southern Pacific Lines were built by the American Locomotive Company and were delivered during 1923 and 1924. These locomotives were designated Class Mt-1 and assigned road numbers 4300 through 4327. They had 28 x 30 cylinders, 73" drivers, a 210 psi boiler pressure, a tractive effort of 57,510 lbs and weighed 368,000 pounds. Later, in 1924 another six ''Mountains'' were delivered from ALCO. These six (road numbers 4385 through 4390) were designated Class Mt-2 and were similar to the Class Mt-1s, but had a 225 psi boiler pressure and a tractive effort of 61,620 pounds.
The Sacramento General Shops of the Southern Pacific built 49 ''Mountains'' between 1925 and 1930. These were built in three batches: road numbers 4385 through 4345 designated Class Mt-3 in 1925 and 1926, road numbers 4346 through 4366 designated class Mt-4 built between 1926 and 1929 and road numbers 4367 through 4376 designated Class Mt-5 in 1929 and 1930. These locomotives were essentially copies of the Class Mt-1s. There are no surviving examples of the Southern Pacific ''Mountains''.
Original Design.
Original Design.
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