West Virginia Central & Pittsburgh / Western Maryland 2-8-0 "Consolidation" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 27/H-3 (Locobase 12019)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 17, p. 210. Works number was 12467 in February 1892.

This WVC Consolidation served both the WVC and its successor Western Maryland unremarkably for 25 years.* In June 1916, it was sold to the evocatively named Reliable Junk Company. (Locobase notes the odd juxtaposition of "reliable" and "junk"...)


Class 30 / H-3f (Locobase 8872)

Data from WM 1 - 1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection; see also Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 20, p. 67.. Works numbers were 14390 in August 1895; 14555-5 in November; 15538 in October 1897 and 15872-73 in April 1898.

Locobase 2101 shows a Coal & Coke design from 1904 that sported the same dimensions, weights, and areas as did this sextet. As both classes operated in the West Virginia coal regions, it isn't surprising that the two would be so similar.

Whereas the Coal & Cokes eventually worked for the Baltimore & Ohio, however, all of the locomotives passed into the Western Maryland when that road bought the WVC & P in 1905; they were dubbed H-3f.

All but one of the class was scrapped in 1924-1928. The #30 was sold to the 72-mile-long Huntingdon & Broad Top Mountain in September 1947.


Class 37 / H-3g (Locobase 12385)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 22, p. 209. Works number was 17431 in February 1900.

37 had an ever so slight difference in the length of the tubes in its boiler from the five 1895 Consolidations described in Locobase 8872. Undoubtedly, there were other significant differences, although a review of the specs for the earlier locomotives fails to reveal them. the five-year difference in production date was enough for the Western Maryland, which placed 37, now 357, in its own subclass.

357 was retired in June 1925.


Class 45 / H-3a / H-3b (Locobase 12001)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 17, p. 131. Works number was 12286 in October 1891.

This Vauclain compound featured two 10 1/2" (267 mm) piston valves, each feeding both the HP and LP cylinders on a side. A second engine with 22" LP cylinders had been produced as a demonstrator (works number 12286) in October 1891 and numbered 127. It was sold late in 1891 to Western Maryland as their #49; see DeGolyer, Volume 17, p. 214.

n a later year, the WM converted the 45 into a simple-expansion 19" x 26".


Class 58/H-3b (Locobase 12243)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 21, p. 83. Works numbers 15590-15595 in November 1897 and 16012-16015 in June 1898.


Class H-3-c (Locobase 8871)

Data from WM 1 - 1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 12794 and 12803 in July 1892.

This pair of Consolidations was delivered in 1892 as Vauclain compounds (Locobase 16164). They were simpled sometime later.

347 was sold to the Virginia Central in June 1920 as their 347. The VC scrapped the engine in 1938. 348 endured on the WM, only going to the scrapyard in October 1952.


Class H-3-c (Locobase 16164)

Data from WM 1 - 1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 18, p. 17 . Works numbers were 12794 and 12803 in July 1892.

Ordered during the first years of the Vauclain compound's popularity, this pair of Consolidations had relatively short strokes and their 10 1/2" (267 mm) piston valves were small compared to later installations. Discussion of how to confirm their theoretical superiority to simple engines appeared in journals regularly and one commentator said to simply put a few dozen in service. An unrelated letter in the 23 June 1892 Engineering News (p. 633) stated that the highest point on a railroad east of the Mississippi was found crossing Kent Ridge 1 1/2 miles north of Davis City on the WVC, which suggests a suitably challenging environment for these locomotives.

They were later simpled; see Locobase 8871.


Class H-4-b (Locobase 8875)

Data from WM 1 - 1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 23, p. 17 and Volume 25, p. 223. Works 17731-32 in May 1900, 18730-31 in March 1901; 21696, 21738 in March 1903; and 21978, 22009 in April.

All of these Consolidations were delivered with Stephenson valve gear, but at least, engine 455, was later fitted with Baker radial gear. Like the other WVC & P 2-8-0s, these were low-drivered freight haulers. And like the others, they came into the Western Maryland in November 1905.

The class met varied fates. 453 was scrapped in February 1928, 452 was sold to Vang Construction Company in February 1929 and scrapped in 1931.

454-456 were sold in 1930 to the Greenbrier, Cheat & Elk Railroad as their 118-119. 118 relettered in November for its owner, Pardee & Curtin Lumber Company. 119 had power reverse installed in 1933 Both regained their WM affiliation and road numbers in 1936 and served until scrapped in 1947 and December 1946.

457-458 were scrapped in January and December 1947, respectively, and 451 went to the ferro-knacker in May 1950. 455 was rebuilt in 1923 and operated until June 1953.


Class H-4/H-4-a (Locobase 8873)

Data from WM 1 - 1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 23, p. 289 and Volume 25, p. 215. Works numbers were 18879-18881,18912-18918 in April 1901 and 21606, 21639, 21682, 21686, 21698, 21711 in February 1903.

One of a series of 2-8-0 designs built for the Western Maryland, most by Baldwin. Some sources credit this set of 16 originally to the West Virginia Central & Pittsburgh, but the Baldwin specifications show Western Maryland as the original purchaser. The specs noted that the tubes were to be spaced to create a 3/4" (19 mm) circulation space around each tube.

Most of the class was retired between 1927 and 1931. Class leader 401 took on a short new career in 1930 as Chesapeake Beach Railway's #10 before it was scrapped in 1935. 409 also went to the CBR as their #9, but was returned to the Western Maryland. Chesapeake Beach was a resort town about 35 miles (56 km) south east of Washington, DC on the western shore of Chesapeake Bay. While the first impulse to build a railway to the proposed site came in 1871, the railroad that was finally built took shape in the 1890s, finally opening in 1901 when the resort was actually completed. It never made money and was on its way to abandonment when the 9 and the 10 operated briefly on its rails. The last train finished its run on 15 April 1935.

When the WM began work on its Connellsville Extension, it sold 404, 407, 411, and 415 to Vang Construction Company. 407 was soon scrapped in 1930 and 415 followed in 1931.

406 and 416 survived until 1941 and 1946, respectively.


Class H-5 (Locobase 1408)

Data from WM 1 - 1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 28, p. 134. Works numbers were 26617, 26635 in October 1905; 26788, 26834-26835, 26857, 26874, 26897, 26915-26918, 26939-26940 in November; 26956-26958, 26979, 26980 in December.

One of a series of 2-8-0 designs built for the Western Maryland, most by Baldwin. Compared to the H-4 class from 1901 (Locobase 8873), this class had smaller drivers and higher steam pressure, which boosted their starting tractive effort. Perhaps the main reason for smaller drivers and the larger boiler was the 10 mile grade that rose a 156 feet to the mile (2.95%). The greater boiler diameter was dictated not only by the increased number of tubes, but also the desire to preserve a 3/4" (19 mm) circulation space among them.

The eighteen engines in this class were retired over a 17-year period from 1927 to 1944. Several -- 501, 506-507, 509, 513, 518 -- were sold in 1930 to the Greenbrier, Cheat & Elk logging road (then a part of the Western Maryland) as 124, 120-121, 125, 123, and 122, respectively. The WM got them back in 1934 with their original numbers.


Class H-6 (Locobase 1409)

Data from WM 1 - 1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 30, p. 173. Works numbers were 29870-29874 in December 1906; 29936-29939, 29958-29961, 29964, 29973-29975, 30014 in January 1907; 30079, 30120, 33204-33211, 33222-33223 in February.

One of a series of 2-8-0 designs built for the Western Maryland, most by Baldwin. Built over a three-year period, the H-6 improved on the H-5 by enlarging the cylinders and increasing driver diameter. Both the boiler and grate substantially increased in surface area, well beyond a simple scaling up based on a cylinder-volume ratio. Placing the grate above the drivers allowed for a significant increase in the firebox width, which grew from 42"(1,067 mm) to 70" (1,778 mm). Outside radial valve gear replaced the inside Stephenson link motion used in earlier engines as well.

These 30 engines in this class were retired beginning 1927, although most were converted to 0-8-0s in the C-1/C-2 classes. Some survived World War II and the 616 was sold to the Winfield Railroad of West Winfield , Pa as their #4 in January 1947.


Class H-6a (Locobase 8320)

Data from WM Misc Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Locobase isn't sure when the firebox and boiler were modified on at least this one engine. The makeover reduced the tube count by 21 while adding significantly to the firebox heating surface through the introduction of thermic syphons.


Class H-7 (Locobase 1410)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 41, p. 319. (Thanks to Chris Hohl for his 27 August 2015 email reporting the original tender weights and capacities.) Baldwin's works numbers were 35153-35155 in August 1910; 35211-35213 in September.

One of a series of 2-8-0 designs built for the Western Maryland. Again, the changes included enlarging the cylinders and increasing driver diameter. These engines were also 16 tons heavier than the H-6s (Locobase 1409). In the 1910 specifications, tender loaded weight was 130,000 lb (58,967 kg) when carrying 7,000 US gallons (26,495 litres) of water and 12 short tons (13.2 tonnes) of coal. The tender specs shown in the Locobase table reflect capacity increases typical for a US trunk line.

Alco's version of the H-7 was the H-7a, the superheated upgrade of which is shown in Locobase 1411.

Retirements began in July 1930 when 705 was sold to the Tennessee Railroad. The other five were all scrapped in 1936.


Class H-7a (Locobase 1411)

One of a series of 2-8-0 designs built for the Western Maryland, but the first of two classes built by Alco. These -7bs added an inch to cylinder diameter and were 9,000 lb heavier than the H-7s. They also served as the template for the K-2 Pacifics built by Baldwin in 1912 (Locobase 175), whose parts were expressly required to be interchangeable with these Alcos.

When superheated, they retained the 9" piston valves (with 6" travel) of the original design.

The last in the class to retire went in 1954.


Class H-7a/b - superheated syphons (Locobase 8887)

Data from WM 1 - 1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Locobase 1410 shows the superheated version of the original H-7 Consolidation. This entry describes the effect of fitting syphons to the firebox. The frame was extended by 5" (127 mm). The combined increase in direct heating surface and 14" (356 mm) piston valves probably contributed to a significant improvement in power.


Class H-7b (Locobase 13937)

One of a series of 2-8-0 designs built for the Western Maryland, but the first of two classes built by Alco. Works numbers were 51396-51402, 51404-51406, 51408-51411. These -7bs added an inch to cylinder diameter and were 9,000 lb heavier than the H-7s. Locobase 1411 has the H-7a delivered by Richmond

They also served as the template for the K-2 Pacifics built by Baldwin in 1912 (Locobase 175), whose parts were expressly required to be interchangeable with these Alcos.

When superheated, they retained the 9" piston valves (with 6" travel) of the original design.

The last in the class to retire went in 1954.


Class H-8 (Locobase 1412)

Data from May 1916 RME table, amended and supplemented by WM 1 - 1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also "Consolidation Locomotives for the Western Maryland Railway," Volume 55, (1 August 1914), pp. 124-126. (Thanks to Chris Hohl for his 3 April 2015 email correcting the valve gear.) Works numbers were 54540-54559 in February 1914.

One of a series of 2-8-0 designs built for the Western Maryland, these reverted to small drivers. The result was low speed, but greater tractive effort in the mountains. 14" (356 mm) piston valves admitted steam to the cylinders and firebox heating surface area included that of the four Security arch tubes.

The H-8s were retired in 1953-1954.


Class H-9a (Locobase 411)

Data from "Consolidation Locomotives for the Western Maryland," Railway Age, Volume 70, No. 19 (13 May 1921), p. 1117-1120; and WM Miscellaneous Steam Locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 58, pp.399+. (Thanks to Chris Hohl for noting the as-built tender capacity.) Works numbers were 54411, 54493-54501 in January 1921; 54609-54613, 54660, 54686-54694 in March; 54714-54717, 54732-54739 in April; 54750-54752 in May; 56027-56028, 56112-56117 in January 1923; 56395-56396 in April.

The class was delivered with 262 sq ft (24.35 sq m) of firebox heating surface. Beginning in the 1930s, the WM added thermic syphons to the firebox, which resulted in the 333 sq ft (30.95 sq m) shown in the specifications. The 14" (356 mm) American semi-plug piston valves had a 7" (178 mm) travel and a 3/16" (4.75 mm) lead. (Note: this design used a snap-ring that expanded to fit the valve chamber when the throttle was closed. When steam was admitted between the seats, a set of wedges locked into a fixed diameter to provide a plug-like seal. One big advantage claimed was much better wear resistance.)

RA reported that the service for which this Consolidation was intended combined relatively light rail (90 lb), tight curves (22 deg maximum), and steep grades of up to 3 1/2%. RA outlines the reasons for going with a 2-8-0 instead of the more fashionable Mikado (2-8-2) then supplanting 2-8-0s on many railroads. In those services that required pulling power and low speed -- heavy drag -- the Consolidation's boiler capacity was adequate. The late cutoff of 88.3% indicates perhaps an unwonted lack of concern about running out of steam.

The first batch was delivered with tenders carrying 16 tons (14,515 kg) of coal in a long, low tank that was designed to keep the center of gravity as low as possible while accommodating a Duplex automatic stoker.. It weighed 270,000 lb (122,470 kg). Beginning with 841, the redesigned tender carried the 20 1/2 tons shown in the specifications.

Later in their careers, the tender carried 23 tons (20.9 tonnes) of coal as shown in the specification above.

Moreover, the lack of a trailing truck meant less maintenance and, "the non-symmetrical wheel-base [wa]s easier on the track." In sum, said RA, "Such a locomotive, with a high percentage of total weight on driving wheels, is well fitted for heavy, slow speed service."

O. S. Nock (RWC IV, plate 169) calls these engines "one of the highest developments of the 2-8-0 type anywhere in the world." He notes that east of Cumberland, Md on the Baltimore-McConnellsville main line, the average revenue tonnage for these engines reached 657 tons (597 metric tons). Maximum train loads reached 7,000 tons.

The Reading's I10 was based on these Western Maryland locomotives; see Locobase 414.

Specifications by Steve Llanso of Sweat House Media
Class27/H-330 / H-3f37 / H-3g45 / H-3a / H-3b58/H-3b
Locobase ID12019 8872 12385 12001 12243
RailroadWest Virginia Central & Pittsburgh (WM)West Virginia Central & Pittsburgh (WM)West Virginia Central & Pittsburgh (WM)Western Maryland (WM)Western Maryland (WM)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class161110
Road Numbers27/30130-34 / 351-35637 / 35745/34958-67/317-326
GaugeStdStdStdStdStd
Number Built161110
BuilderBurnham, Williams & CoBurnham, Williams & CoBurnham, Williams & CoBurnham, Williams & CoBurnham, Williams & Co
Year18921895190018911897
Valve GearStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase14'14.25'14.25'14'14'
Engine Wheelbase21.50'22.33'22.33'21.75'21.50'
Ratio of driving wheelbase to overall engine wheebase 0.65 0.64 0.64 0.64 0.65
Overall Wheelbase (engine & tender)51.68'
Axle Loading (Maximum Weight per Axle)33100 lbs
Weight on Drivers125000 lbs125000 lbs108000 lbs
Engine Weight120000 lbs140000 lbs140000 lbs122000 lbs
Tender Light Weight91600 lbs
Total Engine and Tender Weight231600 lbs
Tender Water Capacity3000 gals4000 gals4500 gals3300 gals3300 gals
Tender Fuel Capacity (oil/coal)9 tons tons tons tons
Minimum weight of rail (calculated)052 lb/yard52 lb/yard45 lb/yard0
Geometry Relating to Tractive Effort
Driver Diameter50"50"50"51"50"
Boiler Pressure140 psi175 psi170 psi200 psi200 psi
High Pressure Cylinders (dia x stroke)20" x 24"21" x 26"21" x 26"13" x 26"20" x 24"
Low Pressure Cylinders (dia x stroke)21" x 26" (2)
Tractive Effort22848 lbs34111 lbs33137 lbs21178 lbs32640 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.66 3.77 5.10
Heating Ability
Firebox Area144 sq. ft159 sq. ft160 sq. ft139 sq. ft138 sq. ft
Grate Area24 sq. ft33.10 sq. ft33.20 sq. ft29.50 sq. ft29.80 sq. ft
Evaporative Heating Surface1819 sq. ft2007 sq. ft2005 sq. ft1897 sq. ft1608 sq. ft
Superheating Surface
Combined Heating Surface1819 sq. ft2007 sq. ft2005 sq. ft1897 sq. ft1608 sq. ft
Evaporative Heating Surface/Cylinder Volume208.44192.56192.37474.93184.26
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation33605793564459005960
Same as above plus superheater percentage33605793564459005960
Same as above but substitute firebox area for grate area2016027825272002780027600
Power L133943920381342284389
Power MT276.55269.00345.23

Specifications by Steve Llanso of Sweat House Media
ClassH-3-cH-3-cH-4-bH-4/H-4-aH-5
Locobase ID8871 16164 8875 8873 1408
RailroadWest Virginia Central & Pittsburgh (WM)West Virginia Central & Pittsburgh (WM)West Virginia Central & Pittsburgh (WM)Western Maryland (WM)Western Maryland (WM)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class2281618
Road Numbers347-34828-29/347-34838-41, 44-47/451-458101-116/401-416501-518
GaugeStdStdStdStdStd
Number Built2281618
BuilderWMBurnham, Williams & CoBurnham, Williams & CoBurnham, Williams & CoBurnham, Williams & Co
Year1892190019011905
Valve GearStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase14'14'14.25'15.33'14.25'
Engine Wheelbase21.75'21.75'22.83'23.67'22.92'
Ratio of driving wheelbase to overall engine wheebase 0.64 0.64 0.62 0.65 0.62
Overall Wheelbase (engine & tender)49.67'49.67'52.90'52.75'52.75'
Axle Loading (Maximum Weight per Axle)30400 lbs045900 lbs35900 lbs42100 lbs
Weight on Drivers118100 lbs110000 lbs157800 lbs141500 lbs163500 lbs
Engine Weight129600 lbs126000 lbs173900 lbs159000 lbs182700 lbs
Tender Light Weight88400 lbs120000 lbs114400 lbs115400 lbs
Total Engine and Tender Weight218000 lbs293900 lbs273400 lbs298100 lbs
Tender Water Capacity4200 gals3000 gals8000 gals8000 gals6000 gals
Tender Fuel Capacity (oil/coal)9 tons9 tons11 tons12 tons12 tons
Minimum weight of rail (calculated)49 lb/yard46 lb/yard66 lb/yard59 lb/yard68 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter50"50"50"56"51"
Boiler Pressure170 psi180 psi190 psi180 psi200 psi
High Pressure Cylinders (dia x stroke)19" x 26"15" x 26"22" x 28"22" x 28"22" x 28"
Low Pressure Cylinders (dia x stroke)22" x 26" (2)
Tractive Effort27126 lbs24440 lbs43773 lbs37026 lbs45173 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.35 4.50 3.60 3.82 3.62
Heating Ability
Firebox Area143 sq. ft139 sq. ft200 sq. ft191 sq. ft200 sq. ft
Grate Area29 sq. ft29 sq. ft37.30 sq. ft35.60 sq. ft37.20 sq. ft
Evaporative Heating Surface1902 sq. ft1897 sq. ft2604 sq. ft2285 sq. ft2614 sq. ft
Superheating Surface
Combined Heating Surface1902 sq. ft1897 sq. ft2604 sq. ft2285 sq. ft2614 sq. ft
Evaporative Heating Surface/Cylinder Volume222.92356.73211.38185.48212.19
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation49305220708764087440
Same as above plus superheater percentage49305220708764087440
Same as above but substitute firebox area for grate area2431025020380003438040000
Power L143453399463244184987
Power MT324.44272.49258.85275.34268.98

Specifications by Steve Llanso of Sweat House Media
ClassH-6H-6aH-7H-7aH-7a/b - superheated syphons
Locobase ID1409 8320 1410 1411 8887
RailroadWestern Maryland (WM)Western Maryland (WM)Western Maryland (WM)Western Maryland (WM)Western Maryland (WM)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class30163010
Road Numbers601-630625701-706707-736752, 754, 756+
GaugeStdStdStdStdStd
Number Built30630
BuilderBurnham, Williams & CoWMBaldwinAlco-RichmondWM
Year1906193619101911
Valve GearWalschaertWalschaertWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase15.33'15.33'16'16.67'16.67'
Engine Wheelbase24'24'25'25.67'26.17'
Ratio of driving wheelbase to overall engine wheebase 0.64 0.64 0.64 0.65 0.64
Overall Wheelbase (engine & tender)58.42'58.42'66.58'68.58'
Axle Loading (Maximum Weight per Axle)47250 lbs47250 lbs61000 lbs62200 lbs
Weight on Drivers182000 lbs182000 lbs202000 lbs215000 lbs216000 lbs
Engine Weight200000 lbs200000 lbs222000 lbs241000 lbs243000 lbs
Tender Light Weight136600 lbs136600 lbs172500 lbs174200 lbs175200 lbs
Total Engine and Tender Weight336600 lbs336600 lbs394500 lbs415200 lbs418200 lbs
Tender Water Capacity7000 gals7000 gals9500 gals9500 gals9500 gals
Tender Fuel Capacity (oil/coal)12 tons12 tons14 tons14 tons14 tons
Minimum weight of rail (calculated)76 lb/yard76 lb/yard84 lb/yard90 lb/yard90 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter57"57"60"60"60"
Boiler Pressure200 psi200 psi200 psi200 psi200 psi
Cylinders (dia x stroke)22" x 30"22" x 30"24" x 30"25" x 30"24" x 30"
Tractive Effort43305 lbs43305 lbs48960 lbs53125 lbs48960 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.20 4.20 4.13 4.05 4.41
Heating Ability
Firebox Area174 sq. ft227 sq. ft187 sq. ft221 sq. ft297 sq. ft
Grate Area52.50 sq. ft52.50 sq. ft54 sq. ft61.80 sq. ft61.80 sq. ft
Evaporative Heating Surface3163 sq. ft3033 sq. ft3466 sq. ft3290 sq. ft3227 sq. ft
Superheating Surface658 sq. ft658 sq. ft
Combined Heating Surface3163 sq. ft3033 sq. ft3466 sq. ft3948 sq. ft3885 sq. ft
Evaporative Heating Surface/Cylinder Volume239.64229.79220.65193.03205.44
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1050010500108001236012360
Same as above plus superheater percentage1050010500108001446114461
Same as above but substitute firebox area for grate area3480045400374005171469498
Power L15805600056041210613540
Power MT281.27290.72244.65496.54552.79

Specifications by Steve Llanso of Sweat House Media
ClassH-7bH-8H-9a
Locobase ID13937 1412 411
RailroadWestern Maryland (WM)Western Maryland (WM)Western Maryland (WM)
CountryUSAUSAUSA
Whyte2-8-02-8-02-8-0
Number in Class152050
Road Numbers750-764770-789801-850
GaugeStdStdStd
Number Built152050
BuilderAlco-RichmondAlco-SchenectadyBaldwin
Year191219141921
Valve GearWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase16.67'16.67'17.50'
Engine Wheelbase25.67'26.17'27.25'
Ratio of driving wheelbase to overall engine wheebase 0.65 0.64 0.64
Overall Wheelbase (engine & tender)66.58'68'74.15'
Axle Loading (Maximum Weight per Axle)58700 lbs57400 lbs73900 lbs
Weight on Drivers216000 lbs217500 lbs287010 lbs
Engine Weight243000 lbs244500 lbs309910 lbs
Tender Light Weight174200 lbs175200 lbs285600 lbs
Total Engine and Tender Weight417200 lbs419700 lbs595510 lbs
Tender Water Capacity9500 gals9500 gals15000 gals
Tender Fuel Capacity (oil/coal)14 tons14 tons23 tons
Minimum weight of rail (calculated)90 lb/yard91 lb/yard120 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter60"51"61"
Boiler Pressure200 psi200 psi210 psi
Cylinders (dia x stroke)25" x 30"25" x 30"27" x 32"
Tractive Effort53125 lbs62500 lbs68263 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.07 3.48 4.20
Heating Ability
Firebox Area221 sq. ft250 sq. ft333 sq. ft
Grate Area61.80 sq. ft61.30 sq. ft74.90 sq. ft
Evaporative Heating Surface3097 sq. ft3169 sq. ft3463 sq. ft
Superheating Surface658 sq. ft625 sq. ft945 sq. ft
Combined Heating Surface3755 sq. ft3794 sq. ft4408 sq. ft
Evaporative Heating Surface/Cylinder Volume181.70185.93163.30
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation123601226015729
Same as above plus superheater percentage145851422219032
Same as above but substitute firebox area for grate area521565800084615
Power L1118801001813726
Power MT485.02406.18421.74

Reference


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