Union Pacific Mountains

The Union Pacific Railroad took delivery of forty 4-8-2s (road numbers 7000 through 7039) from the American Locomotive Company in 1922. These Class MT-1 "Mountains" had 29 x 28 cylinders, 73" drivers, a boiler pressure of 200 psi, a tractive effort of 54,838 lbs and each weighed 348,000 pounds. A year later, fifteen more (road numbers 7850 through 7864) were added to the roster. These last fifteen, ALCO built, Class MT-1s were similar to the ones delivered in 1922 except they weighed 345,000 pounds.

In 1924, five more "Mountains" came from ALCO. These locomotives were designated as Class MT-2 and were assigned road numbers 7865 through 7869. They were oil burners and had 29 x 28 cylinders, 73" drivers, a boiler pressure of 200 psi which resulted in a tractive effort of 54,838 pounds. The combined weight of the Class MT-2 locomotive and its tender was 634,740 lbs with a full load of 15,000 gallons of water and 5,480 gallons of oil.

All of the Union Pacific "Mountains" were scrapped by 1956.

Class	Road Numbers	Year Built	Builder
MT-1	7000-7039	1922	ALCO
MT-1	7850-7864	1923	ALCO
MT-2	7865-7869	1924	ALCO

Specifications for Class MT-1
Wheel Arrangement:	4-8-2
Length:	91' - 2"
Drivers:	73" dia
Weight on Drivers:	230,200 lbs
Total Locomotive Weight:	348,000 lbs
Locomotive & Tender Weight:	605,800 lbs
Grate Area:	84 sq ft
Cylinders:	(2) 29" dia. x 28" stroke
Boiler Pressure:	200 psi
Tractive Effort:	54,838 lbs
Tender Capacity:	12,000 gals. of water and 20 tons of coal.

Note: Class MT-2 locomotives were very similar to the Class MT-1s except they were oil burners and the capacity of the tender was: 15,000 gals. of water and 5,480 gals of fuel oil.

Union Pacific Mountains

Photos

References