New York, Chicago & St Louis 4-6-2 "Pacific" Locomotives in 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 Rail Data Exchange.

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 Rail Data Exchange.

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 / m)13 / 3.9613 / 3.96
Engine Wheelbase (ft / m)34 / 10.3634 / 10.36
Ratio of driving wheelbase to overall engine wheebase 0.38 0.38
Overall Wheelbase (engine & tender) (ft / m)69.15 / 21.0869.15 / 21.08
Axle Loading (Maximum Weight per Axle) (lbs / kg)52,480 / 23,80552,480 / 23,805
Weight on Drivers (lbs / kg)157,250 / 71,327157,250 / 71,327
Engine Weight (lbs / kg)255,320 / 115,811255,320 / 115,811
Tender Loaded Weight (lbs / kg)212,100 / 96,207212,100 / 96,207
Total Engine and Tender Weight (lbs / kg)467,420 / 212,018467,420 / 212,018
Tender Water Capacity (gals / ML)11,000 / 41.6711,000 / 41.67
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)18 / 16.4018 / 16.40
Minimum weight of rail (calculated) (lb/yd / kg/m)87 / 43.5087 / 43.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)73 / 185473 / 1854
Boiler Pressure (psi / kPa)215 / 14.80215 / 14.80
High Pressure Cylinders (dia x stroke) (in / mm)22.5" x 26" / 572x66022.5" x 26" / 572x660
Tractive Effort (lbs / kg)32,951 / 14946.3432,951 / 14946.34
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.77 4.77
Heating Ability
Firebox Area (sq ft / m2)250 / 23.23303 / 28.15
Grate Area (sq ft / m2)50.23 / 4.6750.23 / 4.67
Evaporative Heating Surface (sq ft / m2)3313 / 307.902852 / 264.96
Superheating Surface (sq ft / m2)768 / 71.381350 / 125.42
Combined Heating Surface (sq ft / m2)4081 / 379.284202 / 390.38
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