Nashville, Chattanooga & St. Louis 2-10-0 "Decapod" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class P1-51 (Locobase 8332)

Data from NC&StL 6 - 1951 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See the quite detailed overview published by designer Alphonse I Lipetz, "Russian 'Decapod' Locomotives", The Railway Engineer, Volume 43, No 2 (February 1922), pp. 51-54; April 1922, pp. 136-137; July 1922, pp. 249-251; and November 1922, pp. 415-417.Alco's Richmond Works built the first three (works numbers 58846, 58869, 58870), Baldwin the last two (works numbers 48467 and 48521).

Part of the 200-locomotive residue of an order of Decapods for the 5-foot gauge railways in Russia, the lowest numbered two came directly from the USRA while the latter three originally were assigned to the Southern; on that system, their road numbers were 8013, 8031, and 8032.

The quintet served the N, C & St L on its Paducah, Ky and Huntsville, Ala branches for years. The assignments took advantage of the Decks' relatively low axle loading. As a result, they weren't scrapped until June 1950.

Specifications by Steve Llanso of Sweat House Media
ClassP1-51
Locobase ID8332
RailroadNashville, Chattanooga & St. Louis (NC&StL)
CountryUSA
Whyte2-10-0
Number in Class5
Road Numbers950-954
GaugeStd
Number Built5
Builderseveral
Year1918
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)18.67 / 5.69
Engine Wheelbase (ft / m)27.83 / 8.48
Ratio of driving wheelbase to overall engine wheebase 0.67
Overall Wheelbase (engine & tender) (ft / m)60.46 / 18.43
Axle Loading (Maximum Weight per Axle) (lbs / kg)35,300
Weight on Drivers (lbs / kg)176,500 / 80,059
Engine Weight (lbs / kg)201,000 / 91,172
Tender Loaded Weight (lbs / kg)142,400 / 64,592
Total Engine and Tender Weight (lbs / kg)343,400 / 155,764
Tender Water Capacity (gals / ML)7400 / 28.03
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)14 / 12.70
Minimum weight of rail (calculated) (lb/yd / kg/m)59 / 29.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)52 / 1321
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)25" x 28" / 635x711
Tractive Effort (lbs / kg)51,490 / 23355.50
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.43
Heating Ability
Firebox Area (sq ft / m2)227 / 21.10
Grate Area (sq ft / m2)64.60 / 6
Evaporative Heating Surface (sq ft / m2)2610 / 242.57
Superheating Surface (sq ft / m2)579 / 53.81
Combined Heating Surface (sq ft / m2)3189 / 296.38
Evaporative Heating Surface/Cylinder Volume164.07
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11,628
Same as above plus superheater percentage13,721
Same as above but substitute firebox area for grate area48,215
Power L18783
Power MT548.53