Nashville, Chattanooga & St. Louis 2-8-8-2 "Chesapeake" Locomotives of 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 Raildata collection. See also DeGolyer, Vol 51, pp. 248+. Works numbers were 42736, 42745-42746 in December 1915.

These engines had 41 sq ft of arch tubes to contribute to firebox heating surface. Their steam distribution flowed through 15" 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.

Specifications 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 Wheelbase15'
Engine Wheelbase40.33'
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender)85.96'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers430000 lbs
Engine Weight470000 lbs
Tender Light Weight165600 lbs
Total Engine and Tender Weight635600 lbs
Tender Water Capacity8500 gals
Tender Fuel Capacity (oil/coal)13 tons
Minimum weight of rail (calculated)90 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter56"
Boiler Pressure210 psi
High Pressure Cylinders (dia x stroke)27" x 30"
Low Pressure Cylinders (dia x stroke)41" x 30" (2)
Tractive Effort97248 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.42
Heating Ability
Firebox Area396 sq. ft
Grate Area85.50 sq. ft
Evaporative Heating Surface5448 sq. ft
Superheating Surface1240 sq. ft
Combined Heating Surface6688 sq. ft
Evaporative Heating Surface/Cylinder Volume274.04
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation17955
Same as above plus superheater percentage21366
Same as above but substitute firebox area for grate area98960
Power L17947
Power MT325.96

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