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 15630
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 Wheelbase13'13'
Engine Wheelbase34'34'
Ratio of driving wheelbase to overall engine wheebase 0.38 0.38
Overall Wheelbase (engine & tender)69.15'69.15'
Axle Loading (Maximum Weight per Axle)52480 lbs52480 lbs
Weight on Drivers157250 lbs157250 lbs
Engine Weight255320 lbs255320 lbs
Tender Light Weight212100 lbs212100 lbs
Total Engine and Tender Weight467420 lbs467420 lbs
Tender Water Capacity11000 gals11000 gals
Tender Fuel Capacity (oil/coal)18 tons18 tons
Minimum weight of rail (calculated)87 lb/yard87 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter73"73"
Boiler Pressure215 psi215 psi
Cylinders (dia x stroke)22.5" x 26"22.5" x 26"
Tractive Effort32951 lbs32951 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.77 4.77
Heating Ability
Firebox Area250 sq. ft303 sq. ft
Grate Area50.23 sq. ft50.23 sq. ft
Evaporative Heating Surface3313 sq. ft2852 sq. ft
Superheating Surface768 sq. ft1350 sq. ft
Combined Heating Surface4081 sq. ft4202 sq. ft
Evaporative Heating Surface/Cylinder Volume276.89238.36
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1079910799
Same as above plus superheater percentage1285114255
Same as above but substitute firebox area for grate area6396385991
Power L12508736110
Power MT1055.151518.77


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