Lehigh & Hudson River 4-8-2 "Mountain" Locomotives of the USA

During World War II the Lehigh & Hudson River Railroad needed additional motive power. With new designs restricted it chose to buy duplicates of the Boston & Maine's Class R-1d "Mountain" locomotives. The Baldwin Locomotive Works delivered three (road numbers 10 through 12) in 1944.

Class Details by Steve Llanso of Sweat House Media

Class R-1d (Locobase 207)

Data from tables and diagrams in 1947 Locomotive Cyclopedia. Works numbers were 70183-70185 in April 1944. (Thanks for Chris Hohl for reporting the tender coal capacity decimal error--NO tender ever had a 212-ton capacity--and for noting the later renumbering.)

Identical design to the Boston & Maine's R-1d (Locobase 4410), but built 9 years later to handle high freight traffic demands on the Lehigh & Hudson River from Allentown to Maybrook, NY. Locobase can't explain the 37 sq ft difference in the superheater area, but notes that it's less than 2% of the larger figure.

Marty Feldner, writing in his L & HR website (http://lhr.railfan.net/10steam.htm, visited 18 May 2005), says that these Mountains made a big impression when they went into service. Their boilers didn't handle the local water very well, however, foaming badly and suffering from scaling to a degree that other classes didn't seem to reach. They certainly were powerful and fast, sometimes hitting 70 mph as they gathered momentum for the long eastbound climb from McAfee to Sugar Loaf.

When the L & HR put 13 Alco diesels in service, the 10s (renumbered 40-42) were redundant. Attempts to sell them to other railroads fell through and they were scrapped.

Specifications by Steve Llanso of Sweat House Media
Locobase ID207
RailroadLehigh & Hudson River
Number in Class3
Road Numbers10-12 / 40-42
Number Built3
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase19.25'
Engine Wheelbase44.17'
Ratio of driving wheelbase to overall engine wheebase 0.44
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers269116 lbs
Engine Weight415200 lbs
Tender Light Weight372700 lbs
Total Engine and Tender Weight787900 lbs
Tender Water Capacity23000 gals
Tender Fuel Capacity (oil/coal)21.2 tons
Minimum weight of rail (calculated)112 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter73"
Boiler Pressure240 psi
Cylinders (dia x stroke)28" x 31"
Tractive Effort67918 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.96
Heating Ability
Firebox Area475 sq. ft
Grate Area79 sq. ft
Evaporative Heating Surface4511 sq. ft
Superheating Surface1887 sq. ft
Combined Heating Surface6398 sq. ft
Evaporative Heating Surface/Cylinder Volume204.18
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation18960
Same as above plus superheater percentage24458
Same as above but substitute firebox area for grate area147060
Power L131547
Power MT1033.74

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