Long Island 2-6-2 "Prairie" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class S51 (Locobase 9078)

Data from"Suburban Engine for the Long Island Railroad", Railway and Locomotive Engineering, Volume 17, No 9 (September 1904), p. 397; and DeGolyer, Volume 26, p. 269.. See also Milton J. Foreman, , William Augustus Evans, Paul P Bird, Gilbert E Ryder, Herbert H Evans, The Electrification of Railway Terminals (Chicago: R R Donnelly & Sons, 1908), p 77; and E E R Tratman, "Tank Locomotives", Official Proceedings of the Western Railway Club (Chicago: W F Hall Printing Company, 1903), pp. 342 et seq; Baldwin works numbers 23929-23930, 24008 in March 1904 and 24056, 24082 in April.

R&LE's report spun the high factor of adhesion (5.74) positively, saying it showed "that these Long Island engines are very sure footed passenger train pullers." Pipes leading forward to the side tanks allowed all three to be filled from the rear one and vent pipes let air escape, preserving a uniform water level between all three tanks. Notwithstanding thes virtues, this locomotive was cited as one of many examples of tank locomotives whose characteristics were decried as dirty and inefficient in this promotion of electrification.

This class was sold to the Central of New Jersey in November 1911 as their class J-1 (220-224), joining the 20 engines of identical design purchased in 1902.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassS51
Locobase ID9078
RailroadLong Island
CountryUSA
Whyte2-6-2T
Number in Class5
Road Numbers20-24
GaugeStd
Number Built5
BuilderBurnham, Williams & Co
Year1904
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)14 / 4.27
Engine Wheelbase (ft / m)31.67 / 9.65
Ratio of driving wheelbase to overall engine wheebase 0.44
Overall Wheelbase (engine & tender) (ft / m)31.67 / 9.65
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)130,365 / 59,133
Engine Weight (lbs / kg)188,815 / 85,645
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)188,815
Tender Water Capacity (gals / ML)2875 / 10.89
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)5 / 4.50
Minimum weight of rail (calculated) (lb/yd / kg/m)72 / 36
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 1600
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)18" x 26" / 457x660
Tractive Effort (lbs / kg)22,731 / 10310.62
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.74
Heating Ability
Firebox Area (sq ft / m2)137.40 / 12.76
Grate Area (sq ft / m2)54.50 / 5.06
Evaporative Heating Surface (sq ft / m2)1821 / 169.18
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1821 / 169.18
Evaporative Heating Surface/Cylinder Volume237.80
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,900
Same as above plus superheater percentage10,900
Same as above but substitute firebox area for grate area27,480
Power L16878
Power MT348.94

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