Nashville, Chattanooga & St. Louis 2-8-8-2 "Chesapeake" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class M-1-99 (Locobase 322)

See table in May 1916 Railway Mechanical Engineer and data from NC&StL 6 - 1951 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 51, pp. 248+. (Thanks to Chris Hohl for his 12 January 2017 email noting the 14-ton tender capacity.) Works numbers were 42736, 42745-42746 in December 1915.

These engines had 41 sq ft (3.81 sq m) in four arch tubes and 116 sq ft (10.78 sq m) from the combustion chamber to contribute to firebox heating surface. Their steam distribution flowed through 15" (381 mm) piston valves on the HP cylinders (and slide valves on the big LP jugs). The Baldwin specs show that the M-1-99s were required to pass through No. 6 Frogs and 16 degree 54 minute curves (399 foot; 142.9 metre radii).

Fitted with Baldwin's flexible frame, M-1-99s could handle curves with a radius of 103 yards and were used as pushers over the Cumberland mountains on grades of up to 2.35%.

They were never converted to simple-expansion throughout their 30-year careers, which ended on the scrap heap in April 1945.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID322
RailroadNashville, Chattanooga & St. Louis (NC&StL)
Number in Class3
Road Numbers900-902
Number Built3
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)15 / 4.57
Engine Wheelbase (ft / m)40.33 / 12.29
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender) (ft / m)85.96 / 26.20
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)430,000 / 195,045
Engine Weight (lbs / kg)470,000 / 213,189
Tender Loaded Weight (lbs / kg)165,600 / 75,115
Total Engine and Tender Weight (lbs / kg)635,600 / 288,304
Tender Water Capacity (gals / ML)8500 / 32.20
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)14 / 11.80
Minimum weight of rail (calculated) (lb/yd / kg/m)90 / 45
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56 / 1422
Boiler Pressure (psi / kPa)210 / 14.50
High Pressure Cylinders (dia x stroke) (in / mm)27" x 30" / 686x762
Low Pressure Cylinders (dia x stroke) (in / mm)41" x 30" / 1041x762
Tractive Effort (lbs / kg)97,248 / 44111.00
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.42
Heating Ability
Firebox Area (sq ft / m2)396 / 36.80
Grate Area (sq ft / m2)85.50 / 7.95
Evaporative Heating Surface (sq ft / m2)5448 / 506.32
Superheating Surface (sq ft / m2)1240 / 115.24
Combined Heating Surface (sq ft / m2)6688 / 621.56
Evaporative Heating Surface/Cylinder Volume274.04
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation17,955
Same as above plus superheater percentage21,366
Same as above but substitute firebox area for grate area98,960
Power L17947
Power MT325.96

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