Little River Other Articulated Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 148 (Locobase 4070)

See and DeGolyer, Volume 33, p. 17. See also the Little River Baldwin site's description of the 148 at, last accessed 7 May 2016. Works number was 34088 in November 1909.

The design was rated at 200 tons up a 2 1/2% grade (1 in 40). According to the December 1967 Industrial Railway Record (No 15), two significant design limitations were the requirement to negotiate 160-ft radius curves and the light, 56-lb/yard (28-kg/metre) track.

Little River site says that this 1909 engine reflected design changes inspired by the experience of operating the first Atlantic Mallet described in Locobase 4069. The 148 stayed with the LRR (Townsend, TN) logging railroad for its entire working career, which ended in 1940.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID4070
RailroadLittle River
Number in Class1
Road Numbers148
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)18 / 1.52
Engine Wheelbase (ft / m)32 / 5.49
Ratio of driving wheelbase to overall engine wheebase 0.56
Overall Wheelbase (engine & tender) (ft / m)54.54 / 9.75
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)106,000 / 48,081
Engine Weight (lbs / kg)136,000 / 61,689
Tender Loaded Weight (lbs / kg)72,000 / 32,659
Total Engine and Tender Weight (lbs / kg)208,000 / 94,348
Tender Water Capacity (gals / ML)4000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)1500 / 5.70
Minimum weight of rail (calculated) (lb/yd / kg/m)44 / 22
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)14" x 22" / 356x559
Low Pressure Cylinders (dia x stroke) (in / mm)21" x 22" / 533x559
Tractive Effort (lbs / kg)23,068 / 10463.48
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.60
Heating Ability
Firebox Area (sq ft / m2)101 / 9.39
Grate Area (sq ft / m2)21.50 / 2
Evaporative Heating Surface (sq ft / m2)1518 / 141.08
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1518 / 141.08
Evaporative Heating Surface/Cylinder Volume387.27
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4300
Same as above plus superheater percentage4300
Same as above but substitute firebox area for grate area20,200
Power L13364
Power MT279.86

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