Kanawha & Michigan / Nashville, Chattanooga & St. Louis 2-8-0 "Consolidation" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 156 (Locobase 12768)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 22, p. 57. See also Richard E Prince, The Nashville, Chattanooga, and St. Louis Railway: history and steam locomotives ( Salt Lake City, Utah:Richard E Prince, 1967; reprinted Indiana University Press, 2001), pp. 94-95. Works number was 16516 in February 1899.

Baldwin and the NC & StL wondered if a camelback would prove useful in burning slack coal that would otherwise go unused. Other railroads outside of the anthracite region, including a couple in the Far West, had undertaken such experiments. So Baldwin pulled one of the H5-29s described in Locobase 8325 and substituted a typical Wooten-boilered engine for it.

Little benefit seemed to come from the trial and by 1902 the 156 had been rebuilt as a member of the H5-29 class. But, Prince adds, the Wootten boiler itself "...was altered for stationary duty and served the Chattanooga Union Depot for many years as a steam plant in the boiler room."


Class C-1/H-4B-30 (Locobase 9844)

Data from DeGolyer, Volume 24, p. 95. NC&StL 1 - 1921 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 19714-19718 in November 1901.

This quartet of Consolidations was originally delivered from Baldwin in 1902. After they were sold to the Nashville, Chattanooga & Saint Louis in 1916, they were renumbered. By that time, the boilers had given up six of their tubes and the firebox heating surface then measured 171 sq ft (15.9 sq m). Total evaporative heating surface area amounted to 1,873 sq ft (174 sq m).

Except for 348, which was scrapped in March 1929, the class were sent to the ferro-knacker on 24 July 1936.


Class C-6/H-4-30 (Locobase 9841)

Data from DeGolyer, Volume 26, p. 49. NC&StL 2 - 1947 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 21195-21196, 21250-21251, 21279 in November 1902.

The K & M was chartered in 1890 and linked Point Pleasant and Charleston, West Virginia, in 1892. The 1893 completion of a bridge over the New River allowed the K & M to link to the Chesapeake & Ohio and thus find an outlet to the Ohio River and beyond. It eventually reached Corning, Ohio on its own rails.

Ownership details are surprisingly fuzzy, but both the Hocking Valley and the Toledo & Ohio Central appear to have had financial interests. The C & O had bought the K & M in 1910, but was forced to divest in 1914 at which point the line was bought by the T & OC. (The T & OC became part of the New York Central system in 1922. The K & M did not surrender its independent identity until 1938, when it was merged with the T & OC.)

These Belpaire-boilered Consolidations constituted half of a ten-locomotive order; the other five went to the Hocking Valley (Locobase 11960).

The class was disposed of within a couple of years of the T&OC takeover, being sold to the Nashville, Chattanooga & St Louis in 1916. A slight reworking of the boiler increased the tube count to 240 tubes, which together with a recalculation of the firebox heating surface to 175.44 sq ft (16.3 sq m) increased the total evaporative heating surface to 1,903 sq ft (176.85 sq m). Adhesion weight increased to 137,000 lb and engine weight rose to 152,900 lb (

After another 20 years, three of the H4A-30 class were scrapped in the same month and year (July 1936), but the 341 and 342 weren't scrapped until September 1947 and January 1948, respectively.


Class H-0-27 (Locobase 6870)

Data from NC&StL 9 - 1925 Locomotive Diagrams-CLR CHTS supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Volume 20, p. 264. Works numbers were 12427 and 12434 in January 1892, 15263 in April 1897.

The first two engines were delivered with boilers pressed to 145 psi (10 bar), which led the NC&StL to place them in class H-0-24; boiler pressure setting was later raised to 160 psi (11.03 bar). 97 was displayed at the 1897 Tennessee Centennial and International Exposition in Nashville. The specifications were prepared by N C & StL Superintendent of Motive Power James Cullen. The iron dome was described as "helmet shaped".

96 was scrapped in March 1932; 95 and 96 followed in October of that year.


Class H-0-28 (Locobase 6873)

Data from NC&StL 9 - 1925 Locomotive Diagrams-CLR CHTS supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Upright pair of Consolidations with relatively tall drivers and a small grate for the Dixie Line 2-8-0s.


Class H-0-28 (Locobase 9843)

Data from NC&StL 1 - 1921 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

This single locomotive is described in the 1921 diagrams as a switcher. It had a narrow, but deep firebox.


Class H-1-12 (Locobase 6867)

Data from NC&StL 9 - 1925 Locomotive Diagrams-CLR CHTS supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Small Consolidations with very modest boiler proportions. Even so,

All were sold or scrapped in 1915-1916


Class H-2-26 - rebuilt (Locobase 6869)

Data from NC&StL 9 - 1925 Locomotive Diagrams-CLR CHTS supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

This quartet of Consolidations resembled the single locomotive shown in Locobase 6868, but with a big jump in heating surface and some expansion of grate area. They appear to be rebuilds of four earlier engines from the early 1890s. The small tender suggests short-distance duty.


Class H-3-28 (Locobase 6871)

Data from NC&StL 9 - 1925 Locomotive Diagrams-CLR CHTS supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Locobase figures that repeating a 9-year-old design (the one described in Locobase 6870) to a virtual T must have been dictated axle-loading considerations. The boiler was pressed a little harder, but otherwise there seem to be no significant innovations.


Class H-4-28 (Locobase 6872)

Data from NC&StL 9 - 1925 Locomotive Diagrams-CLR CHTS supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Upright pair of Consolidations with relatively tall drivers and a small grate for the Dixie Line 2-8-0s.


Class H4C-28 (Locobase 9842)

Data from NC&StL 1 - 1921 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

As delivered, these Consolidations were fitted with equipment from the following suppliers:

Richardson slide valves

Latrobe tires

United Slates metallic packing, phosphor bronze bearings

American equalized brakes

Nathan lubricators

Crosby gauges

French springs

Sterlingworth brakebeams

Coale muffled safety valves

Monitor injectors

Buck 22-inch headlights.


Class H5-29 (Locobase 8325)

Data from NC&StL 1 -1 1921 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Volume 22, p. 55. Works numbers were 16510-16516 in February 1899; 18195-18196, 18223-18224 in September; 18278-18279, 18304, 18310-18312 in October; 19546-19549 in September 1901; and 19636-19638 in October.

This looks like an enlargement of the Baldwin Consolidation that arrived on the NC&St L two years earlier. . Its appearance was marked by a small steam dome centered over the gap between the 2nd and 3rd driven axles and a capped stack. Road #156 of the class was completed as a camelback to burn slack coal; see Locobase 12768.

Its firebox heating surface increased to 177.22 sq ft (16.47 sq m) when the railroad added 15 sq ft (1.39 sq m) of arch tubes

The first of the class was retired in 1934, but several were superheated (Locobase 9845) and the last lasted until 1950.


Class H5C-31 superheated (Locobase 9845)

Data from NC&StL 1 - 1921 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

When the H5 series was superheated, it received a relatively rare large-tube layout, Walschaert radial gear, and 13" piston valves.


Class H6-37 (Locobase 9846)

Data from NC&StL 6 - 1951 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Volume 25, p. 29. Works numbers were 20944 in September 1902; 21157 in October; 21275 in November; 21567 in January 1903; 21631, 21636 in February; 21772 in March; 22060 in April; 22279, 22334 in June.

This class duplicated many of the specifications developed for the earlier 20 x 26" Consolidations shown in Locobase 8325. But the cylinder volume, grate area, and boiler size represented a substantial enlargement in power and steaming capacity over earlier NC&StL Consolidations.

Sometime later the NC&StL superheated the class; see Locobase 8326.


Class H6A-39 - superheated (Locobase 8326)

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

When this class was delivered in 1902-1903, it was with saturated boilers; see Locobase 12766. . Sometime later the N, C & St L superheated the class. The process involved the usual trade off between small tubes and larger flues. And the firebox heating surface now included 20 sq ft of arch tubes.

All of the class served at least 40 years each with the first being retired in 1946 and the last in 1952.


Class H7-36 (Locobase 9847)

Data from NC&StL 1 - 1921 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 23231, 23236, 23281 in November 1903, 23291, 23378, 23389, 23464, 23465 in December; 23493, 23505 in January 1904; 23831, 24524-24525, 24541, 24558, 24561-24562, 24638 in August; 24647, 24674-24675 in September; and 25064, 25083 in February.

Following right on the heels of the H6As (Locobase 8327), this class had the same power dimensions and grate, but substantially more heating surface.

See Locobase 8327 for the superheated update.


Class H7A-37 (Locobase 12767)

Data from NC&StL 1 - 1925 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 23231, 23236, 23281 in November 1903, 23291, 23378, 23389, 23464, 23465 in December; 23493, 23505 in January 1904; 23831, 24524-24525, 24541, 24558, 24561-24562, 24638 in August; 24647, 24674-24675 in September;25064, 25083 in February 1905; 29636-29637, 29687, 29729, 29828-29829 in December 1906.

Following right on the heels of the H6As (Locobase 9846), this class had the same power dimensions and grate, but substantially more heating surface.

See Locobase 8327 for the superheated update.


Class H7B-37 (Locobase 12993)

Data from NC&StL 1 - 1925 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 31464, 31492-31493, 31552, 31579 in August 1907; 31840 in September; 32001-32002 in October; 35793-35794, 35812-35813 in December 1910; 35826-35831 in January 1911

The NC & StL distinguished between the 1905-1906 Consolidations from Baldwin (Locobase 12767) and this set, which arrived almost two years later.

See Locobase 8327 for the superheated update.


Class H7C-40 - superheated (Locobase 8327)

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

When the H7s (Locobases 9847, 12767, and 12993) were superheated, the modification involved the usual tradeoff of tubes and flues.

All of the class operated into the late 1940, with retirements beginning in 1948 and ending in 1952.


Class H8-40 (Locobase 9849)

Data from NC&StL 1 - 1921 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Baldwin works #23291 was produced in December 1903, 25772 came out in May 1905

This pair of relatively large, saturated-boiler Consolidations was supplied one at a time at an 18-month interval. When ordered, the 99 had 347 tubes amassing 2,614 sq ft of heating surface area and 2,786 sq ft overall.

At least some of these were superheated; see Locobase 9850.


Class H8B-40 (Locobase 11062)

Data from NC&StL 1 - 1921 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 29571, 29603, 29635 in November 1906.

This trio of Consolidations repeated the design shown in Locobase 9849 (H8A-40), but reduced the number of boiler tubes cons

At least some of these were superheated; see Locobase 9850.


Class H8C-40 (Locobase 9850)

Data from NC&StL 1 - 1921 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

When the 5-locomotive H8 class (Locobase 9849) was superheated, the weights stayed the same, but the boiler tubes and flues apparently shrank slightly. The firebox heating surface area increased thanks to the addition of 30 sq ft of arch tubes.

All remained in service until 1948-1950.


Class H9-44/H9-46 (Locobase 13680)

Data from NC&StL 6 - 1951 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 35793-35794, 35812-35813 in December 1910; 35826-35831 in January 1911.

These Consolidations were delivered with 22" diameter cylinders and Richardson Balanced slide valves.. Before too long, the railroad had fitted them with new, 24" diameter cylinders and redesignated the class H9-46. The firebox heating surface included 23.1 sq ft of arch tubes.

Before too long, the NC & StL had superheated the class; see Locobase 8328.


Class H9-46 - superheated H9-44 (Locobase 8328)

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

According to Connelly, these Consolidations were delivered with 22" diameter cylinders; they were then designated H9-44 (Locobase 13680). Before too long, the railroad had fitted them with new, 24" diameter cylinders. The firebox heating surface included 23.1 sq ft of arch tubes.

Then the road superheated the class, swapping tubes for flues and 13" piston valves for the Richardson Balanced slide valves. After the makeover, the H9s were the most powerful 2-8-0s to operate on the N, C & St L, serving the road for more than 40 years. The first to be scrapped -- 455 -- went in July 1950. The others followed in the next year and a half, ending with 450 and 459 in 1953.

Specifications by Steve Llanso of Sweat House Media
Class156C-1/H-4B-30C-6/H-4-30H-0-27H-0-28
Locobase ID12,768 9844 9841 6870 6873
RailroadNashville, Chattanooga & St. Louis (NC&StL)Kanawha & Michigan (NC&StL)Kanawha & Michigan (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class15531
Road Numbers156274-278/345-349505-509/340-34495-97/308-310325
GaugeStdStdStdStdStd
Number Built15531
BuilderBurnham, Williams & CoBurnham, Williams & CoBurnham, Williams & CoBurnham, Williams & CoRogers
Year18991901190218921902
Valve GearStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)15.9215.92151414
Engine Wheelbase (ft)23.6723.672321.5021.67
Ratio of driving wheelbase to overall engine wheebase 0.67 0.67 0.65 0.65 0.65
Overall Wheelbase (engine & tender) (ft)52.9247.6248
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)134,000133,000111,955125,300
Engine Weight (lbs)150,000150,000126,255138,100
Tender Loaded Weight (lbs)91,300109,40081,90073,900
Total Engine and Tender Weight (lbs)241,300259,400208,155212,000
Tender Water Capacity (gals)40004000500040003300
Tender Fuel Capacity (oil/coal) (gals/tons)1012.70 7.50 7.50
Minimum weight of rail (calculated) (lb/yd)56554752
Geometry Relating to Tractive Effort
Driver Diameter (in)55.6354545050
Boiler Pressure (psi)195180180170175
High Pressure Cylinders (dia x stroke) (in)20" x 26"20" x 26"20" x 26"20" x 24"19" x 26"
Tractive Effort (lbs)30,98729,46729,46727,74427,923
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.55 4.51 4.04 4.49
Heating Ability
Firebox Area (sq ft)172.01162167.20148.40175.68
Grate Area (sq ft)7631.5330.1030.7230.27
Evaporative Heating Surface (sq ft)20151898187316571875
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)20151898187316571875
Evaporative Heating Surface/Cylinder Volume213.14200.76198.12189.88219.76
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation14,8205675541852225297
Same as above plus superheater percentage14,8205675541852225297
Same as above but substitute firebox area for grate area33,54229,16030,09625,22830,744
Power L154984640464238944706
Power MT305.36307.78306.72331.20

Specifications by Steve Llanso of Sweat House Media
ClassH-0-28H-1-12H-2-26 - rebuiltH-3-28H-4-28
Locobase ID9843 6867 6869 6871 6872
RailroadNashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class15432
Road Numbers326300-304306-30980-82 / 315-317320-321
GaugeStdStdStdStdStd
Number Built1532
BuilderRogersRogersNC&StLBurnham, Williams & CoRogers
Year18911884190919061896
Valve GearStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)15.5811.33141415.92
Engine Wheelbase (ft)23.4219.8321.5021.5023.67
Ratio of driving wheelbase to overall engine wheebase 0.67 0.57 0.65 0.65 0.67
Overall Wheelbase (engine & tender) (ft)4839.454944.4250.08
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)124,15055,350119,500123,600130,000
Engine Weight (lbs)143,00064,280135,000138,000145,600
Tender Loaded Weight (lbs)184,00043,80073,000100,00090,200
Total Engine and Tender Weight (lbs)327,000108,080208,000238,000235,800
Tender Water Capacity (gals)40001700320040004000
Tender Fuel Capacity (oil/coal) (gals/tons) 9.50 3.50 7.501110.50
Minimum weight of rail (calculated) (lb/yd)5223505254
Geometry Relating to Tractive Effort
Driver Diameter (in)5036505056
Boiler Pressure (psi)150140160170175
High Pressure Cylinders (dia x stroke) (in)22" x 24"15" x 18"20" x 24"20" x 24"20" x 26"
Tractive Effort (lbs)29,62113,38826,11227,74427,625
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.19 4.13 4.58 4.46 4.71
Heating Ability
Firebox Area (sq ft)194.1577.36153.10148.56170.50
Grate Area (sq ft)28.8712.8936.6030.7428.15
Evaporative Heating Surface (sq ft)1846789232316491744
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1846789232316491744
Evaporative Heating Surface/Cylinder Volume174.82214.31266.20188.96184.47
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation43311805585652264926
Same as above plus superheater percentage43311805585652264926
Same as above but substitute firebox area for grate area29,12310,83024,49625,25529,838
Power L133342683471938834486
Power MT236.82427.46348.24277.04304.31

Specifications by Steve Llanso of Sweat House Media
ClassH4C-28H5-29H5C-31 superheatedH6-37H6A-39 - superheated
Locobase ID9842 8325 9845 9846 8326
RailroadNashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class523241010
Road Numbers335-339150-155, 157-173 /350-373174-183/374-383374-383
GaugeStdStdStdStdStd
Number Built5231010
BuilderRichmondBurnham, Williams & CoNCStLBurnham, Williams & CoNC&StL
Year190018991902
Valve GearStephensonStephensonWalschaertStephensonWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)1615.9215.9215.7515.33
Engine Wheelbase (ft)23.9623.6723.6723.6723.67
Ratio of driving wheelbase to overall engine wheebase 0.67 0.67 0.67 0.67 0.65
Overall Wheelbase (engine & tender) (ft)52.7151.3351.3352.4659.70
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)135,000134,900139,000140,700144,000
Engine Weight (lbs)154,000151,700159,000156,900161,000
Tender Loaded Weight (lbs)104,20091,30091,300109,000148,000
Total Engine and Tender Weight (lbs)258,200243,000250,300265,900309,000
Tender Water Capacity (gals)40004000400050004000
Tender Fuel Capacity (oil/coal) (gals/tons)10.501012.5010.5010
Minimum weight of rail (calculated) (lb/yd)5656585960
Geometry Relating to Tractive Effort
Driver Diameter (in)5856565656
Boiler Pressure (psi)180180180195175
High Pressure Cylinders (dia x stroke) (in)20" x 26"20" x 26"21" x 26"21" x 28"23" x 28"
Tractive Effort (lbs)27,43428,41431,32736,54839,344
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.92 4.75 4.44 3.85 3.66
Heating Ability
Firebox Area (sq ft)156162177.22168188
Grate Area (sq ft)29.8031.1231.1246.6046.60
Evaporative Heating Surface (sq ft)21922039147122651681
Superheating Surface (sq ft)303373
Combined Heating Surface (sq ft)21922039177422652054
Evaporative Heating Surface/Cylinder Volume231.86215.68141.13201.79124.85
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation53645602560290878155
Same as above plus superheater percentage53645602655490879623
Same as above but substitute firebox area for grate area28,08029,16037,32332,76038,822
Power L154705063819550357252
Power MT357.31330.97519.91315.57444.11

Specifications by Steve Llanso of Sweat House Media
ClassH7-36H7A-37H7B-37H7C-40 - superheatedH8-40
Locobase ID9847 12,767 12,993 8327 9849
RailroadNashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class101020165
Road Numbers184-193 / 384-393194-209 / 394-409210-229 / 410-42998-99 / 420-421
GaugeStdStdStdStdStd
Number Built1010205
BuilderBurnham, Williams & CoBurnham, Williams & CoBurnham, Williams & CoNCStLBurnham, Williams & Co
Year1903190519071903
Valve GearStephensonStephensonWalschaertWalschaertStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)15.3315.3315.3315.3314.67
Engine Wheelbase (ft)23.6723.6723.6723.6723.42
Ratio of driving wheelbase to overall engine wheebase 0.65 0.65 0.65 0.65 0.63
Overall Wheelbase (engine & tender) (ft)52.5452.5452.5459.7052.54
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)150,300150,300150,300153,300163,000
Engine Weight (lbs)166,300166,200166,300170,300183,000
Tender Loaded Weight (lbs)109,000109,000109,000148,00095,300
Total Engine and Tender Weight (lbs)275,300275,200275,300318,300278,300
Tender Water Capacity (gals)50005000500040004000
Tender Fuel Capacity (oil/coal) (gals/tons)10.5010.5010.50108
Minimum weight of rail (calculated) (lb/yd)6363636468
Geometry Relating to Tractive Effort
Driver Diameter (in)5655.6355.635650
Boiler Pressure (psi)195200195180190
High Pressure Cylinders (dia x stroke) (in)21" x 28"21" x 28"21" x 28"23" x 28"21" x 28"
Tractive Effort (lbs)36,54837,73436,79140,46939,884
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.11 3.98 4.09 3.79 4.09
Heating Ability
Firebox Area (sq ft)171.42169172.13191179.10
Grate Area (sq ft)46.6046.6046.6046.6046.89
Evaporative Heating Surface (sq ft)24472148215418872693
Superheating Surface (sq ft)405
Combined Heating Surface (sq ft)24472148215422922693
Evaporative Heating Surface/Cylinder Volume218.00191.36191.90140.15239.92
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation90879320908783888909
Same as above plus superheater percentage90879320908798988909
Same as above but substitute firebox area for grate area33,42733,80033,56540,56834,029
Power L153574944485680945062
Power MT314.31290.08284.91465.60273.86

Specifications by Steve Llanso of Sweat House Media
ClassH8B-40H8C-40H9-44/H9-46H9-46 - superheated H9-44
Locobase ID11,062 9850 13,680 8328
RailroadNashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)Nashville, Chattanooga & St. Louis (NC&StL)
CountryUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-0
Number in Class351010
Road Numbers322-324 / 422-424420-424220-229450-459
GaugeStdStdStdStd
Number Built310
BuilderBurnham, Williams & CoNCStLBaldwinNC&StL
Year190619111911
Valve GearStephensonWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)14.6714.671616
Engine Wheelbase (ft)23.4223.4225.3325.33
Ratio of driving wheelbase to overall engine wheebase 0.63 0.63 0.63 0.63
Overall Wheelbase (engine & tender) (ft)52.5452.5458.0858.08
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)163,000163,000192,100192,100
Engine Weight (lbs)183,000183,000214,000216,000
Tender Loaded Weight (lbs)109,000109,000141,115141,115
Total Engine and Tender Weight (lbs)292,000292,000355,115357,115
Tender Water Capacity (gals)5000500065006500
Tender Fuel Capacity (oil/coal) (gals/tons)10.5010.501818
Minimum weight of rail (calculated) (lb/yd)68688080
Geometry Relating to Tractive Effort
Driver Diameter (in)50505656
Boiler Pressure (psi)190190200175
High Pressure Cylinders (dia x stroke) (in)21" x 28"21" x 28"22" x 30"24" x 30"
Tractive Effort (lbs)39,88439,88444,07945,900
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.09 4.09 4.36 4.19
Heating Ability
Firebox Area (sq ft)179.10219.10214240.10
Grate Area (sq ft)46.8946.895555
Evaporative Heating Surface (sq ft)2413211734162705
Superheating Surface (sq ft)421545
Combined Heating Surface (sq ft)2413253834163250
Evaporative Heating Surface/Cylinder Volume214.97188.60258.81172.21
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8909890911,0009625
Same as above plus superheater percentage890910,42411,00011,261
Same as above but substitute firebox area for grate area34,02948,70642,80049,160
Power L14667987663449161
Power MT252.49534.30291.23420.54


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