Seaboard Air Line Mountains

The Seaboard Air Line Railroad receive its first ten "Mountains" (road numbers 200 through 209) the American Locomotive Company in 1914. These locomotives were designated as Class M and had 27 x 28 cylinders, 69" drivers, a boiler pressure of 190 psi, a tractive effort of 47,800 lbs and weighed 316,000 pounds. Another five (road numbers 210 through 214) arrived from ALCO in 1917 and were duplcates of the the earlier Class M. The "Mountains" were put to work in passenger service.

Ten more 4-8-2s (road numbers 215 through 224) were delivered from ALCO in 1922. These locomotives were designated as Class M-1 and were similar to those of Class M.

The SAL wanted more speed and ordered a total of 36 more "Mountains" with 72" drivers. These 4-8-2s were built by the Baldwin Locomotive Works and were delivered in three batches between 1924 and 1926. They had 27 x 28 cylinders, 72" drivers, and a boiler pressure of 200 psi which resulted in a tractive effort of 48,200 pounds.

All of the SAL "Mountains" were scrapped.

ClassRoad NumbersYear BuiltBuilder
M200 - 2091914ALCO
M210 -2141917ALCO
M-1215 - 2241922ALCO
M-2225 - 2441924Baldwin
M-2245 - 2601925Baldwin
M-2261 - 2701926Baldwin

Specifications
 Class M-1Class M-2
Wheel Arrangement:4-8-24-8-2
Length:87' - 0"94' - 10"
Drivers:69" dia.72" dia.
Weight on Drivers:214,000 lbs213,450 lbs
Locomotive Weight:320,000 lbs320,90 lbs
Locomotive & Tender Weight:503,000 lbs519,400 lbs
Grate Area:66.7 sq ft66.7 sq ft
Cylinders (dia. x stroke):(2) 27" x 28"(2) 27" x 28"
Boiler Pressure:190 psi200 psi
Tractive Effort:47,800 lbs48,200 lbs
Tender Capacity
Water:9,000 gals.10,000 gals.
Coal:17 tons20 tons

References

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