Northern Pacific 2-6-2 "Prairie" Type Locomotives

Class T (Locobase 817)

Procured for light freight service. 10 later converted to light Mikados as the W-4s. 18 more were modified as T-1s.

Data from table in June 1907 American Engineer and Railroad Journal.

Class T-1 (Locobase 818)

Modified from Ts in the 1920s.

Specifications
ClassTT-1
Locobase ID817818
RailroadNorthern Pacific (NP)Northern Pacific (NP)
Whyte2-6-22-6-2
Road Numbers2300-24492450-2467
GaugeStdStd
BuilderAlco-BrooksAlco
Year19061907
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase11'13'
Engine Wheelbase28.92'28.92'
Ratio of driving wheelbase to overall engine wheebase 0.38 0.45
Overall Wheelbase (engine & tender)57.29'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers152000 lbs156000 lbs
Engine Weight209500 lbs208500 lbs
Tender Light Weight148500 lbs148500 lbs
Total Engine and Tender Weight358000 lbs357000 lbs
Tender Water Capacity8000 gals8000 gals
Tender Fuel Capacity (oil/coal)12 tons12 tons
Minimum weight per yard of rail on which locomotive could run84.44 lb rail86.67 lb rail
Geometry Relating to Tractive Effort
Driver Diameter63"63"
Boiler Pressure200 psi200 psi
Cylinders (dia x stroke)21" x 28"21.5" x 28"
Tractive Effort33320 lbs34926 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.56 4.47
Heating Ability
Firebox Area235 sq. ft
Grate Area43.50 sq. ft43.50 sq. ft
Evaporative Heating Surface23401920
Superheating Surface400
Combined Heating Surface23402320
Evaporative Heating Surface/Cylinder Volume208.47163.19
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation87008700
Same as above plus superheater percentage870010200
Same as above but substitute firebox area for grate area470000
Power L16576.150
Power MT286.140

Reference

Credits

Introduction and specifications provided by Steve Llanso of Sweat House Media.

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