New York, Chicago & St Louis 4-6-2 "Pacific" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class K-1A/K-1B (Locobase 1385)

Data from NKP 5 - 1950 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Lima delivered four K-1A (works numbers were 6317-6320 in December 1922), Alco-Brooks six K-1B (works numbers were 64631-64636 in August 1923). Drury (1993) says these were smaller and lighter than the USRA designs.

All had 14" (356 mm) piston valves. The K-1As had slightly less evaporative heating surface and the firebox heating surface also amounted to less than the K-1Bs.


Class K-1B - Type E superheater (Locobase 15630)

Data from NKP 2 - 1944Locomotive Diagrams supplied in August 2013 by Allen Stanley from his extensive Raildata collection.

The Nickel Plate took three of its Schenectady K-1B Pacifics and substantially altered the boiler by replacing the original Type A superheater with a Type E.

Specifications by Steve Llanso of Sweat House Media
ClassK-1A/K-1BK-1B - Type E superheater
Locobase ID1385 15,630
RailroadNew York, Chicago & St Louis (Nickel Plate)New York, Chicago & St Louis (Nickel Plate)
CountryUSAUSA
Whyte4-6-24-6-2
Number in Class103
Road Numbers160-169164, 168, 169
GaugeStdStd
Number Built10
BuilderseveralNKP
Year1922
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)1313
Engine Wheelbase (ft)3434
Ratio of driving wheelbase to overall engine wheebase 0.38 0.38
Overall Wheelbase (engine & tender) (ft)69.1569.15
Axle Loading (Maximum Weight per Axle) (lbs)52,48052,480
Weight on Drivers (lbs)157,250157,250
Engine Weight (lbs)255,320255,320
Tender Loaded Weight (lbs)212,100212,100
Total Engine and Tender Weight (lbs)467,420467,420
Tender Water Capacity (gals)11,00011,000
Tender Fuel Capacity (oil/coal) (gals/tons)1818
Minimum weight of rail (calculated) (lb/yd)8787
Geometry Relating to Tractive Effort
Driver Diameter (in)7373
Boiler Pressure (psi)215215
High Pressure Cylinders (dia x stroke) (in)22.5" x 26"22.5" x 26"
Tractive Effort (lbs)32,95132,951
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.77 4.77
Heating Ability
Firebox Area (sq ft)250303
Grate Area (sq ft)50.2350.23
Evaporative Heating Surface (sq ft)33132852
Superheating Surface (sq ft)7681350
Combined Heating Surface (sq ft)40814202
Evaporative Heating Surface/Cylinder Volume276.89238.36
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,79910,799
Same as above plus superheater percentage12,85114,255
Same as above but substitute firebox area for grate area63,96385,991
Power L125,08736,110
Power MT1055.151518.77


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