Colorado Southern, New Orleans & Pacific / Jonesboro, Lake City & Eastern / Kansas City, Fort Scott & Memphis / Saint Louis-San Francisco / St Louis, Memphis & Southeastern / St Louis-San Francisco 2-8-0 "Consolidation" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 1200 (Locobase 2442)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005).. Also see table in the June 1907 American Engineer and Railroad Journal (AERJ), referring to an earlier article on p. 194 of the same year. Works numbers were 30310 in February 1907; 30319-30321, 30330-30331, 30355-30359, 30380-30382, 30401, 30408, 30425-30427, 30472, 30483, 30543 in March 1907; 30639, 30665-30666, 30741 in April.

Contemporary coverage suggests that this railroad's origins were difficult to ascertain clearly. Railway Age reported that contrary to the assertion that this was a Frisco subsidiary, the CS, NO & P actually represented a reconstituted Colorado & Southern in hopes of skirting a gubenatorial veto of the original charter. The Financial Review confirmed that ownership belonged to the Frisco and would for 999 years.

The main line linked Baton Rouge. La., to Houston, Tex.. (373 miles) and enjoyed trackage rights over the Illinois Central to New Orleans. Another route took the road from De Quincey to Houston.

First Frisco Consolidation to have more than 3,000 sq ft of heating surface. These retained their slide valves throughout their operating lives.

Some confusion in the FMIG tabulation.. Baldwin delivered 51 (1200-1250) in 1907-1909; the latter half of the order were slightly heavier and are shown in Locobase 2444. 45 more slightly heavier versions (1251-1295) were delivered by Alco-Schenectady, but these were transferred to the Rock Island soon after delivery. Their numbers were reused in two batches. The first 15 went to superheated duplicates supplied by Baldwin in 1909. The remainder (1266-1295) had 26" x 30" cylinders and 63" drivers.


Class 1226 (Locobase 2444)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005). Works numbers were 31936-31937, 31961-31962, 31977-31978, 32000, 32004-32006, 32039-32043, 32073-32076, 32090-32091, 32104 in October 1907; 32154, 32175, 32209 in November; 33735-33738, 33762-33767, 33810-33812, 33822, 33839 in September 1909.

Repeats of the 1200 class (Locobase 2442), but with more weight on the drivers. Although delivered with slide valves, they were later fitted with piston valves.


Class 1226 - superheated (Locobase 8637)

Data from StLSF 1930, StL&SF 1947, and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Originally delivered as saturated-steam Consolidations in 1907, most of this class was superheated in the 1920s. Unusually for such conversions, the net loss of heating surface was held to a minimum. This was probably due to the large diameter of the boiler to begin with.


Class 1266 (Locobase 2445)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005). Works numbers were 34120-34121, 34139-34142 in December; 34165-34167, 34183-34184, 34220-34221, 34226 in January 1910.

Recasting of the basic Frisco Consolidation, this time with longer tubes (but fewer of them), larger cylinders supplied by 12"-diameter piston valves, taller drivers, and even more weight on the drivers. Although they would all be grouped under the same class after being superheated (Locobase 2446), this class was delivered with saturated boilers and with Emerson superheaters (Locobase 13673).


Class 1266 - superheated (Locobase 2446)

Data from SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Although originally supplied by Schenectady in 1910, this class was rebuilt by the Frisco in 1922-1924 for some reason. There were many variations as detailed in the notes to the diagram page, but the version shown in the specs seems to have predominated.

As with the 1306 class, the diagrams record the last out by noting the engines in the class "were dismissed from service between 7-17-51 & 2-25-52."


Class 1281 (Locobase 2443)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005).


Class 1293 (Locobase 13674)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 25, p.211. Works numbers were 35381-35387, 35411-35414, 35441 in October 1910 and 35474 in November.

Firebox heating surface included 32 sq ft of arch tubes. The last 13 of a large class of Consolidations (Locobase 2466) was delivered directly to the New Orleans, Texas & Mexico and had an Emerson superheater installed. The entire class would be updated with Schmidt superheaters in 1922-1924; see Locobase 2446.


Class 1306 (Locobase 2447)

Firebox heating surface included 30 sq ft of arch tubes.

Data from SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

The book shows that this class fragmented into several sub-classes over time. One of the two main variants was the one shown in the specs, a type that had thermic syphons. The other had fewer tubes (239 vs 261) and arch tubes instead of syphons; the result was 205 sq ft of firebox area and 2,842.7 sq ft of EHS.

In an interesting variation on the usual notation, the diagrams close the record by saying that the engines in the class "were dismissed from service between 7-17-51 & 2-25-52."

Some information also provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005) describes one engine.


Class 156 / 500 / 950 (Locobase 2439)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/fmig28.htm . Data also from StLSF 1904, StLSF 1908 description, and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Builder information from B Rumary list supplied by Allen Stanley in March 2004. Works numbers were 2127-2132 (July 1900). The KC, FS & M was absorbed by the St Louis-San Francisco in 1901. When the Frisco renumbered this class, it was to the 500 range first, then the 950 series. Some time later, the railroad reduced the tube counts by varying amounts to 280, 276, 268, and 266 tubes. The firebox heating surface includes 15.9 sq ft of arch tubes.

Retirements occurred in two widely separated waves. 950 and 954 were "dismissed from service" in March and April 1927, respectively. All of the others operated for another 12 years before 952 went in January 1939, 955 in February, and 951 and 953 in August.


Class 270 / 956 (Locobase 2440)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005). Data also from StLSF 1904, StLSF 1908 description, and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers ran from 26228 to 26237.

Most of the class saw their tube counts reduced from 302 2 1/4" tubes each to 292 2" tubes, sacrificing 338 sq ft of heating surface. This diminution in tube size may have been prompted by a desire for more effective water circulation in the boiler. On the other hand, arch tubes and other modifications increased firebox heating surface from 138 sq ft to 165.4 sq ft..

This was a long-lived class with the earliest retirement coming when 961 was "dismissed from service"in May 1946. The last locomotive (957) was retired in April 1950.


Class 2735 (Locobase 2453)

Interesting trio of refugees from the Pennsylvania Railroad. Not known when they got to the Frisco. The Class I Consolidation (later class H-1) constituted one of the largest classes on the Pennsylvania; see Locobase 1141. The data shown here differ slightly from the H-1 data, which could reflect minor differences in batches produced within the total of 545 locomotives in this class.

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm . (Note: the official name of the railroad was the St. Louis-San Francisco or St.L-SF)


Class 40 (Locobase 8551)

Data from SL&SF All Time Loco Diagrams HS Pub supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Vol 65, pp. 164+. Works numbers were 54265-54266 in January 1921.

These Baldwins were small, superheated Consolidations that arrived in Arkansas in early 1921. The notes to the diagrams indicated that the 77 had a brick arch and 12.2 more sq ft (1.1 sq m) of firebox heating surface, which suggests a single arch tube was part of the arch. The Frisco diagram shows a 368 sq ft (34.2 sq m) superheater area while Baldwin's spec shows 292. Given that the former shows a superheater percentage of 22%, which is high for this kind of locomotive, Locobase chose the latter value. Note, because the Moguls shown in Locobase 14380 ran into trouble with ash pans warping (probably because of too little clearance), the spec warned that the builder should "take measures to prevent this on this locomotive."

According to the current owner of the 76 -- the Ohio Central Railroad (http://www.ocsteam.com/76/index.html, accessed 7 July 2007) -- the Frisco leased the 76 in November 1925.

After World War II, both locomotives were sold to the Mississipian Railway (24-mile long short line also known as the Bentonite Line). 77 went first in March 1947 with 76 following in January 1948. There, the two 2-8-0s "...were kept in topnotch condition by a unique team of two brothers. In a return to a nearly-forgotten 19th Century railroad custom, each brother had his "own" engine. Jim Carlisle normally operated No. 76, while his brother Frank operated No. 77 Depending on whose locomotive was in service on any given day, one man was engineer and the other served as the conductor."

In 1967, 76 was bought by Sloan Cornell, who operated it on several museum roads such as the Penn View Mountain Railroad and Blairsville & Indiana Railroad and the Gettysburg Railroad. In 1999, the Ohio Central bought the 76 from Cornell.

77 moved on from the Mississippian in 1968 to the Muscle Shoals Railroad Club, which was renamed in 1980 as the North Alabama Railroad Club. This engine went on to the Magnolia State Railway in 1984, the Central Western Railway in 1989, and finally to the Alberta Prairie Railway Excursions, headquartered in Stettler, Alta, where it regained its original #41.


Class 60/259/724/2724 (Locobase 2451)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005). See also DeGolyer, Volume 13, p. 136. Works numbers were 8324-8328, 8339, 8345 in January 1887.

For their cylinder volume, these engines had good-sized boilers and grates.

After three renumberings, the class quickly diminished through dismantling in 1915-1916. 2728-2729 remained on the roster until the early 20s and were scrapped in December 1922.


Class 69/269/700/2700 (Locobase 6777)

Data from KCC&S 1884 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See the reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm . DeGolyer, Volume 11, p. 19. Works numbers were 5473 in January 1881; 5476, 5482 in February; 5820, 5831 in September; 5915 in November; 5983, 5987, 6022-6023 in January 1882; 6058, 6060 in February; 6076, 6078, 6092-6093 in March.

The first nine engines in this order were assigned road numbers in order of their works numbers. For some reason, the others did not and established a pattern that persisted over the next three renumberings, as the table shows:

266-274/700-709, 2700-2708. The 73 was named Jacob Rogers.

75/275/709/2709

77/277/711/2711

76/276/710/2710

79/279/713/2713

78/278/712/2712

81/281/715/2715

80/280/714/2714


Class 716 / 2716 (Locobase 2449)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005). Additional Data from StLSF 1904 and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.


Class 720 / 2720 (Locobase 2450)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005). Additional data from StLSF 1904 and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 1578-1581 in June 1884.

Works numbers from compilation of Cooke locomotives by B.Rumary (25 Kingscombe, Gurney Slade, Radstock, BA3 4TH, ENGLAND) and supplied to Locobase by Allen Stanley in March 2004.

A look at 2448-2450 shows how the same specification could generate three slightly different engines. The Rogers engine had the most tubes and the most weight on the drivers.


Class 731 / 2731 (Locobase 2452)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005). Additional data from StLSF 1904 and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.


Class 801 (Locobase 2433)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005). Also data from StLSF 1904, StLSF 1908 description, and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. JF Webber's list of Dickson locomotives (conveyed to Locobase by Allen Stanley in March 2004) gives the works numbers as 1156-1173 and road numbers as 501-518.

Most had their tube counts reduced to 240, which resulted in a total heating surface of 1,916.2 sq ft.

Except for 817 & 818, "dismissed from service" in May and April 1926, respectively, this class remained in service into the middle of the 1930s and 805-806 were let go in April 1945. 810 was sold to the Seneca Coal & Mining Company for the Alabama Central Railroad in November 1940.


Class 819 (Locobase 2434)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005). Data also from StLSF 1904, StLSF 1908 description, and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Pittsburgh produced these as a batch -- works #25311-25320 -- in January-February 1902 and Richmond followed with 25331-25335 in March 1902.

Like most of the other Frisco engines, this class saw a reduction in tube count in its boiler over the years. As it entered service, the design disposed 267 2 1/4" tubes and a firebox heating surface of 184 sq ft. The specifications above show that over time the Frisco reduced the tube count by 25 and the diameter of all tubes to 2". Moreover the firebox area shrank by 18 sq ft, possibly through elimination of the brick arch.

All but three were "dismissed from service" in the early to mid 30s. 827 went in February 1939, 821 in February 1941, and 819 in October 1946.


Class 834 (Locobase 2432)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm . Data also from StLSF 1904, StLSF 1908 description, and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Produced as a pair (works #26512-26513) in January 1903, these engines saw only a modest reduction in tube area over their working lives. By the time they were "dismissed from service" in November 1936 and August 1939, respectively, they had 303 tubes and a total heating surface of 2,310.7 sq ft.


Class 850 (Locobase 2436)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005).. Data also from StLSF 1904, StLSF 1908 description, and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

This pair of light Consolidations (works #38033, 38049) had quite different lengths of service. 851 was "dismissed from service" at Springfield, Mo in May 1935 while 850 carried on until November 1946 before being retired at Joplin.


Class 860 (Locobase 2437)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm . Data also from StLSF 1904, StLSF 1908 description, and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Brooks produced the pair (works #1374 & 1379) in 1900.

These light Consolidations had relatively big boilers for the Frisco; 861 had two fewer tubes and 16 sq ft less total heating surface area.

860 was "dismissed from service" in September 1934 while 861 lasted until September 1939.


Class 970 (Locobase 2441)

Data provided by reprint of FMIG #28, a Frisco Lines newsletter, at http://www.frisco.org/fmig/newsletters/fmig28.htm (accessed 22 August 2005). Data also from StLSF 1904, StLSF 1908 description, and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers ran from 29623 in December 1906 to 29885 in January 1907.

As the Frisco modified the boilers in this class, they departed from usual practice. The shops still took out the 268 2 1/4" tubes originally installed, but they replaced them with 24 more 2" tubes. This meant that the total heating surface area dropped by only 55 sq ft from 2,444 sq ft.

Between April 1916 and December 1916, the Frisco sold 10 of this class to the New Orleans, Texas & Mexico as their road numbers 101-110. The engines were 971-975, 977-978, 982-983, 985.

All of the others, by now mostly oil burners, saw increases in their firebox heating suface. They remained in service until the late 1940s.

Specifications by Steve Llanso of Sweat House Media
Class120012261226 - superheated12661266 - superheated
Locobase ID2442 2444 8637 2445 2446
RailroadColorado Southern, New Orleans & Pacific (SLSF)St Louis-San Francisco (Frisco/(SLSF)St Louis-San Francisco (Frisco/(SLSF)St Louis-San Francisco (Frisco/(SLSF)St Louis-San Francisco (Frisco/(SLSF)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class2640351513
Road Numbers1200-12251226-12651226-12651266-12801266-1305
GaugeStdStdStdStdStd
Number Built264015
BuilderBurnham, Williams & CoBurnham, Williams & CoFriscoBaldwinFrisco shops
Year19071907192219101922
Valve GearWalschaertWalschaertWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)1616161717
Engine Wheelbase (ft)24.3324.3324.332626
Ratio of driving wheelbase to overall engine wheebase 0.66 0.66 0.66 0.65 0.65
Overall Wheelbase (engine & tender) (ft)55.7555.7555.8758.8358.33
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)178,000187,000187,000195,050212,500
Engine Weight (lbs)198,000207,000207,000215,700237,000
Tender Loaded Weight (lbs)148,400148,400148,400148,400149,700
Total Engine and Tender Weight (lbs)346,400355,400355,400364,100386,700
Tender Water Capacity (gals)58007500750075007500
Tender Fuel Capacity (oil/coal) (gals/tons)1212121212
Minimum weight of rail (calculated) (lb/yd)7478788189
Geometry Relating to Tractive Effort
Driver Diameter (in)5757576363
Boiler Pressure (psi)200200200200190
High Pressure Cylinders (dia x stroke) (in)22" x 30"22" x 30"22" x 30"23" x 30"26" x 30"
Tractive Effort (lbs)43,30543,30543,30542,82451,988
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.11 4.32 4.32 4.55 4.09
Heating Ability
Firebox Area (sq ft)163178221163200.60
Grate Area (sq ft)5151515050
Evaporative Heating Surface (sq ft)31223100250229282543
Superheating Surface (sq ft)529578
Combined Heating Surface (sq ft)31223100303129283121
Evaporative Heating Surface/Cylinder Volume236.53234.87189.56202.96137.94
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,20010,20010,20010,0009500
Same as above plus superheater percentage10,20010,20011,93410,00011,305
Same as above but substitute firebox area for grate area32,60035,60051,71432,60045,356
Power L15667574412,04654499467
Power MT280.75270.87568.06246.36392.87

Specifications by Steve Llanso of Sweat House Media
Class128112931306156 / 500 / 950270 / 956
Locobase ID2443 13,674 2447 2439 2440
RailroadSt Louis-San Francisco (Frisco/(SLSF)Saint Louis-San Francisco (SLSF)St Louis-San Francisco (Frisco/(SLSF)Kansas City, Fort Scott & Memphis (SLSF)St Louis, Memphis & Southeastern (SLSF)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class171344610
Road Numbers1281-12921293-13051306-1349156-161 / 500-05 / 950-55270-279 / 956-965
GaugeStdStdStdStdStd
Number Built1344610
BuilderAlco-BrooksBaldwinAlco-SchenectadyPittsburghDickson
Year19101910191219001902
Valve GearWalschaertWalschaertWalschaertStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)17171715.7515.42
Engine Wheelbase (ft)26262624.2523.83
Ratio of driving wheelbase to overall engine wheebase 0.65 0.65 0.65 0.65 0.65
Overall Wheelbase (engine & tender) (ft)5858.8361.9554.0955.17
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)201,100180,000226,400154,000155,500
Engine Weight (lbs)227,200201,000251,200171,000174,500
Tender Loaded Weight (lbs)149,700155,000162,900105,000143,800
Total Engine and Tender Weight (lbs)376,900356,000414,100276,000318,300
Tender Water Capacity (gals)75007500810050006000
Tender Fuel Capacity (oil/coal) (gals/tons)1212141014
Minimum weight of rail (calculated) (lb/yd)8475946465
Geometry Relating to Tractive Effort
Driver Diameter (in)6363635557
Boiler Pressure (psi)185165195190200
High Pressure Cylinders (dia x stroke) (in)26" x 30"26" x 30"26" x 30"21" x 28"21" x 28"
Tractive Effort (lbs)50,62045,14753,35636,25836,827
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.97 3.99 4.24 4.25 4.22
Heating Ability
Firebox Area (sq ft)231.30212238.30191.90165.40
Grate Area (sq ft)505050.3031.7544
Evaporative Heating Surface (sq ft)25412884305524482382
Superheating Surface (sq ft)578525624
Combined Heating Surface (sq ft)31193409367924482382
Evaporative Heating Surface/Cylinder Volume137.84156.44165.72218.09212.21
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation92508250980960338800
Same as above plus superheater percentage11,008948811,47660338800
Same as above but substitute firebox area for grate area50,92140,22754,36836,46133,080
Power L19377814710,95452875432
Power MT411.19399.13426.67302.75308.05

Specifications by Steve Llanso of Sweat House Media
Class27354060/259/724/272469/269/700/2700716 / 2716
Locobase ID2453 8551 2451 6777 2449
RailroadSt Louis-San Francisco (Frisco/(SLSF)Jonesboro, Lake City & Eastern (SLSF)St Louis-San Francisco (Frisco/(SLSF)St Louis-San Francisco (Frisco/(SLSF)St Louis-San Francisco (Frisco/(SLSF)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class327164
Road Numbers2735-273740-41 / 76-7760-65/259-265/724-730/2724-273066-75, 77, 76, 79, 78, 81, 802716-2719
GaugeStdStdStdStdStd
Number Built327164
BuilderAltoonaBaldwinBurnham, Parry, Williams & CoBurnham, Parry, Williams & CoRogers
Year18771920188718811881
Valve GearStephensonWalschaertStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)13.67141414.7514.75
Engine Wheelbase (ft)21.5421.6722.4222.8322.66
Ratio of driving wheelbase to overall engine wheebase 0.63 0.65 0.62 0.65 0.65
Overall Wheelbase (engine & tender) (ft)46.6252.1246.2046.3747.35
Axle Loading (Maximum Weight per Axle) (lbs)25,800
Weight on Drivers (lbs)87,000119,000100,20093,10089,500
Engine Weight (lbs)102,000135,800141,200108,200104,000
Tender Loaded Weight (lbs)72,300107,80084,50084,60084,500
Total Engine and Tender Weight (lbs)174,300243,600225,700192,800188,500
Tender Water Capacity (gals)32004500400028004200
Tender Fuel Capacity (oil/coal) (gals/tons)81088
Minimum weight of rail (calculated) (lb/yd)3650423937
Geometry Relating to Tractive Effort
Driver Diameter (in)5151515151
Boiler Pressure (psi)135200155135135
High Pressure Cylinders (dia x stroke) (in)20" x 24"19" x 24"20" x 24"20" x 24"20" x 24"
Tractive Effort (lbs)21,60028,88024,80021,60021,600
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.03 4.12 4.04 4.31 4.14
Heating Ability
Firebox Area (sq ft)106130.90145124.50137
Grate Area (sq ft)2227.5030.2527.6026.60
Evaporative Heating Surface (sq ft)12851307190713151634
Superheating Surface (sq ft)292
Combined Heating Surface (sq ft)12851599190713151634
Evaporative Heating Surface/Cylinder Volume147.25165.95218.53150.69187.24
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation29705500468937263591
Same as above plus superheater percentage29706490468937263591
Same as above but substitute firebox area for grate area14,31030,89222,47516,80818,495
Power L123879906397425483049
Power MT241.95734.08349.75241.35300.42

Specifications by Steve Llanso of Sweat House Media
Class720 / 2720731 / 2731801819834
Locobase ID2450 2452 2433 2434 2432
RailroadSt Louis-San Francisco (Frisco/(SLSF)St Louis-San Francisco (Frisco/(SLSF)St Louis-San Francisco (Frisco/(SLSF)St Louis-San Francisco (Frisco/(SLSF)St Louis-San Francisco (Frisco/(SLSF)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class4418142
Road Numbers86-89 / 2720-27232731-2734501-518 / 801-818819-833834-835
GaugeStdStdStdStdStd
Number Built4418142
BuilderCookeRogersDicksonAlcoAlco-Brooks
Year18841884190019021903
Valve GearStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)15.081416.5015.4216.50
Engine Wheelbase (ft)22.7522.2523.4223.4222.92
Ratio of driving wheelbase to overall engine wheebase 0.66 0.63 0.70 0.66 0.72
Overall Wheelbase (engine & tender) (ft)46.8048.6051.6751.7252.17
Axle Loading (Maximum Weight per Axle) (lbs)24,50027,000
Weight on Drivers (lbs)85,100104,900142,000145,200145,000
Engine Weight (lbs)101,000118,300158,000161,300164,000
Tender Loaded Weight (lbs)84,50084,500113,000111,300125,800
Total Engine and Tender Weight (lbs)185,500202,800271,000272,600289,800
Tender Water Capacity (gals)40004000500050006200
Tender Fuel Capacity (oil/coal) (gals/tons)88121213
Minimum weight of rail (calculated) (lb/yd)3544596160
Geometry Relating to Tractive Effort
Driver Diameter (in)5151575751
Boiler Pressure (psi)135155185190200
High Pressure Cylinders (dia x stroke) (in)20" x 24"20" x 24"21" x 28"21" x 28"20" x 28"
Tractive Effort (lbs)21,60024,80034,06534,98637,333
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.94 4.23 4.17 4.15 3.88
Heating Ability
Firebox Area (sq ft)133141152166.10156.70
Grate Area (sq ft)27.9531.203130.2051.60
Evaporative Heating Surface (sq ft)14411847199019402376
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)14411847199019402376
Evaporative Heating Surface/Cylinder Volume165.13211.65177.29172.83233.37
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation377348365735573810,320
Same as above plus superheater percentage377348365735573810,320
Same as above but substitute firebox area for grate area17,95521,85528,12031,55931,340
Power L127693853430644555276
Power MT286.94323.90267.41270.57320.87

Specifications by Steve Llanso of Sweat House Media
Class850860970
Locobase ID2436 2437 2441
RailroadSt Louis-San Francisco (Frisco/(SLSF)St Louis-San Francisco (Frisco/(SLSF)St Louis-San Francisco (Frisco/(SLSF)
CountryUSAUSAUSA
Whyte2-8-02-8-02-8-0
Number in Class2220
Road Numbers850-851860-861970-989
GaugeStdStdStd
Number Built2220
BuilderAlco-BrooksBrooksBurnham, Williams & Co
Year190519001906
Valve GearStephensonStephensonWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)1617.3315.33
Engine Wheelbase (ft)24.2525.5023.67
Ratio of driving wheelbase to overall engine wheebase 0.66 0.68 0.65
Overall Wheelbase (engine & tender) (ft)4758.1054.75
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)154,500166,100160,100
Engine Weight (lbs)174,500185,500181,500
Tender Loaded Weight (lbs)110,000136,500128,300
Total Engine and Tender Weight (lbs)284,500322,000309,800
Tender Water Capacity (gals)500040006000
Tender Fuel Capacity (oil/coal) (gals/tons)121412
Minimum weight of rail (calculated) (lb/yd)646967
Geometry Relating to Tractive Effort
Driver Diameter (in)576355
Boiler Pressure (psi)200200200
High Pressure Cylinders (dia x stroke) (in)19.5" x 28"21" x 30"21" x 28"
Tractive Effort (lbs)31,75435,70038,167
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.87 4.65 4.19
Heating Ability
Firebox Area (sq ft)182209.20200
Grate Area (sq ft)44.2033.5047.90
Evaporative Heating Surface (sq ft)239628972416
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)239628972416
Evaporative Heating Surface/Cylinder Volume247.56240.89215.24
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation884067009580
Same as above plus superheater percentage884067009580
Same as above but substitute firebox area for grate area36,40041,84040,000
Power L1649068855579
Power MT370.43365.53307.30

Reference


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