Nashville, Chattanooga & St. Louis 4-8-2 "Mountain" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class J-1a (Locobase 8329)

Data from NC&StL 6 - 1951 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Firebox fitted with combustion chamber, which contributed to the firebox heating surface area as did 14 sq ft of arch tubes and 73 sq ft of thermic syphons. These were the standard USRA Light Mountain design. According to Charles B Castner, writing in Drury (1993), these J1s were immediately successful on the Chattanooga Division. Baldwin delivered 8 more with revised boilers and fireboxes in 1922 and 1925; see Locobase 212.

Although bumped from the premium runs by the J2 and J3 4-8-4s, the class ran until 1949-1951.


Class J-1b/c (Locobase 212)

Data from 1930 Locomotive Cyclopedia table and NC&StL 6 - 1951 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Vol 68, pp. 329+. Works numbers were 55642 in September 1922, 55719-55720 in November, and 58386-58390 in May 1925.

After Alco's Richmond works supplied five USRA Light Mountain locomotives to the N, C & St L in 1919 (see Locobase 8329). When the 4-8-2 proved its worth, the road turned to Baldwin for more Mountains. Although the power dimensions were the same, the boiler saw a drop in small tubes in favor of more superheater flues. The firebox was fitted with combustion chamber, which contributed 107 sq ft (9.95 sq m) to the firebox heating surface area as did 27 sq ft (2.5 sq m) of arch tubes - the total was 348 sq ft.

Within a few years the supplementary heating area would be changed by removing two of the four arch tubes (leaving 14 sq ft (1.25 sq m) of arch tubes) and adding 76 sq ft of thermic syphons to arrive at a total of 411 sq ft of direct heating surface.

They served the NC & St L for more than 25 years before heading to the scrapyard in September 1949 (6) and October 1950 (556 and 558).

Specifications by Steve Llanso of Sweat House Media
ClassJ-1aJ-1b/c
Locobase ID8329 212
RailroadNashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)
CountryUSAUSA
Whyte4-8-24-8-2
Number in Class58
Road Numbers550-554555-562
GaugeStdStd
Number Built58
BuilderAlco-RichmondBaldwin
Year19191922
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase18.25'18.25'
Engine Wheelbase40'40'
Ratio of driving wheelbase to overall engine wheebase 0.46 0.46
Overall Wheelbase (engine & tender)75.83'77.33'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers224500 lbs224500 lbs
Engine Weight327000 lbs340000 lbs
Tender Light Weight192000 lbs192000 lbs
Total Engine and Tender Weight519000 lbs532000 lbs
Tender Water Capacity10000 gals10000 gals
Tender Fuel Capacity (oil/coal)16 tons16 tons
Minimum weight of rail (calculated)94 lb/yard94 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter69"69"
Boiler Pressure200 psi200 psi
Cylinders (dia x stroke)27" x 30"27" x 30"
Tractive Effort53883 lbs53883 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.17 4.17
Heating Ability
Firebox Area408 sq. ft411 sq. ft
Grate Area70.30 sq. ft70.30 sq. ft
Evaporative Heating Surface4181 sq. ft4039 sq. ft
Superheating Surface966 sq. ft1080 sq. ft
Combined Heating Surface5147 sq. ft5119 sq. ft
Evaporative Heating Surface/Cylinder Volume210.31203.17
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1406014060
Same as above plus superheater percentage1673117013
Same as above but substitute firebox area for grate area9710499462
Power L11725518296
Power MT677.79718.68


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