Chesapeake & Ohio 4-8-2 "Mountain" Locomotives of the USA

The Chesapeake & Ohio Railroad was the first to take delivery of a locomotive with a 4-8-2 wheel arrangement with the arrival of number 316 (later number 540) in 1911.

The C&O bought two 4-8-2s from the American Locomotive Company and designated them Class J-1. They were assigned road numbers 316 and 317 and were put to test in June, 1911. Another one, road number 318, was ordered and delivered from ALCO in 1912. All three worked well in passenger service.

In 1918, three "Mountains" (road numbers 133 through 135) with 69" drivers were received from ALCO and two (road numbers 136 and 137) came from the Baldwin Locomotive Works. These five locomotives were built according to USRA specifications and were of the Heavy Mountain design and were designated Class J-2 by the C&O.

In June of 1923, a final two of the Class J-2 locomotives (road numbers 138 and 139) were delivered by ALCO. By 1924, all ten of the C&O "Mountains" were renumbered 540 through 549.

The C&O had a locomotive modernization program in the 1930s and the seven Class J-2 "Mountains received new cabs, new feedwater heaters, the flying-pump front ends, a general overhaul and Vanderbilt tenders.

All ten of the "Mountains" were retired and scrapped by 1952.


Class Details by Steve Llanso of Sweat House Media

Class J-1 (Locobase 198)

Data from C&O 9-1936 and C&O 12-1946 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. 49840-49841 in May 1911 and 50848 in March 1912.

The firebox heating surface included 28 sq ft (2.6 sq m) of arch tubes.

These are considered to be the first of the Mountain type, originally built for the C&O to handle 700 tons over the Clifton Forge Division in the Allegheny Mountains.

Eugene L Huddleston, writing in the November 2000 issue of the Chesapeake & Ohio Historical Magazine ("C&O's J-1 & K-1"), notes that the J-1s could hit the desired speeds with a heavy train (10 cars). Yet, the design had "ridiculously low drivers" and "extremely long main rods." In addition to the effects accompanying the high rpm of such small drivers at high speeds, driving the set on the third axle increased the dynamic augment and hence the stress on the tracks. (Most Mountains, says Huddleston, were driven on the second axle.) A late-1920s solution involved lengthening the piston rod and supporting the longer Alligator crosshead guide with a second yoke.

That the design had power was undeniable -- combustion chamber, superheater, huge boiler, automatic smoker. The trio enjoyed a long career on the two mountain divisions on which they ran because the large boiler meant plenty of steam and the low drivers were less of a liability.


Class J-2 (Locobase 1420)

Firebox heating surface included 99 sq ft of thermic syphons. Boiler had feedwater heater.

USRA heavy Mountain. Only 15 "Heavy" mountains entered service under the USRA, of which five (Alco-Brooks works numbers were 59810-59812 in December 1918 and Baldwin works numbers 51869-51881 in June 1919 ) went to the Chesapeake and Ohio. Richmond delivered two more sisters in 1923 (works numbers were 64216-64217 in July 1923.).

Specifications by Steve Llanso of Sweat House Media
ClassJ-1J-2
Locobase ID198 1420
RailroadChesapeake & Ohio (C&O)Chesapeake & Ohio (C&O)
CountryUSAUSA
Whyte4-8-24-8-2
Number in Class37
Road Numbers316-318/130-132/540-542133-139/543-549
GaugeStdStd
Number Built37
BuilderAlco-RichmondSeveral
Year19111918
Valve GearWalschaertBaker
Locomotive Length and Weight
Driver Wheelbase (ft)16.5018.25
Engine Wheelbase (ft)37.4240
Ratio of driving wheelbase to overall engine wheebase 0.44 0.46
Overall Wheelbase (engine & tender) (ft)76.1175.70
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)238,000246,850
Engine Weight (lbs)330,000363,550
Tender Loaded Weight (lbs)219,100300,000
Total Engine and Tender Weight (lbs)549,100663,550
Tender Water Capacity (gals)12,00016,000
Tender Fuel Capacity (oil/coal) (gals/tons)152016
Minimum weight of rail (calculated) (lb/yd)99103
Geometry Relating to Tractive Effort
Driver Diameter (in)6269
Boiler Pressure (psi)180200
High Pressure Cylinders (dia x stroke) (in)29" x 28"28" x 30"
Tractive Effort (lbs)58,11057,948
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.10 4.26
Heating Ability
Firebox Area (sq ft)338438
Grate Area (sq ft)66.5076.20
Evaporative Heating Surface (sq ft)41084727
Superheating Surface (sq ft)8501085
Combined Heating Surface (sq ft)49585812
Evaporative Heating Surface/Cylinder Volume191.91221.09
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11,97015,240
Same as above plus superheater percentage14,00518,136
Same as above but substitute firebox area for grate area71,183104,244
Power L111,68517,946
Power MT432.96641.10

Reference


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