Lehigh & Hudson River 4-8-2 "Mountain" Locomotives in 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 nine 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 (3.44 sq m) 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 (113 kph) 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.

Principal Dimensions 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 Wheelbase (ft / m)19.25 / 5.87
Engine Wheelbase (ft / m)44.17 / 13.46
Ratio of driving wheelbase to overall engine wheebase 0.44
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)269,116 / 122,069
Engine Weight (lbs / kg)415,200 / 188,332
Tender Loaded Weight (lbs / kg)372,700 / 169,054
Total Engine and Tender Weight (lbs / kg)787,900 / 357,386
Tender Water Capacity (gals / ML)23,000 / 87.12
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)21.20 / 19.30
Minimum weight of rail (calculated) (lb/yd / kg/m)112 / 56
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)73 / 1854
Boiler Pressure (psi / kPa)240 / 16.50
High Pressure Cylinders (dia x stroke) (in / mm)28" x 31" / 711x787
Tractive Effort (lbs / kg)67,918 / 30807.12
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.96
Heating Ability
Firebox Area (sq ft / m2)475 / 44.13
Grate Area (sq ft / m2)79 / 7.34
Evaporative Heating Surface (sq ft / m2)4511 / 419.08
Superheating Surface (sq ft / m2)1887 / 175.31
Combined Heating Surface (sq ft / m2)6398 / 594.39
Evaporative Heating Surface/Cylinder Volume204.18
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation18,960
Same as above plus superheater percentage24,458
Same as above but substitute firebox area for grate area147,060
Power L131,547
Power MT1033.74

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