Santa Fe 4-6-2 "Pacific" Type Locomotives

Introduction

Baldwin built fifty of the 3400 class 4-6-2s between 1919 and 1924. They were the last pacifics bought by the Santa Fe, as the thirty-five "3500 class" 4-6-2s were balanced compounds, dating to 1914. The 3400s were designed by John Purcell, who became the ATSF's head of motive power in 1912. Purcell stopped the wild experimentation that marked the ATSF in the early years of the 20th century, when the ATSF bought balanced compounds and even more exotic articulateds with hinged boilers.

Under Purcell, the Santa Fe bought large groups of big locomotives, like the 2-8-2, 2-10-2 and 4-6-2. There was nothing fancy about these locomotives. They were simple two cylinder machines, that operated on slightly lower than normal boiler pressure and lacked most of the modern appliances that improved the efficiency of steam locomotives. Purcell felt the extra efficiencies were not worth the extra maintenance costs, and the AT&SF let other railroads do the innovating after 1912.

The 3400 class originally was equipped with 73" drivers, but between 1935 and 1941, the Topeka shops rebuilt all fifty into much better machines. Elesco feedwater heaters and 79" box-pok drivers were fitted, and the 3400s lasted until 1950, when they began to be retired. They were all gone by 1955, except the ones that were saved for display.

Class Details by Steve Llanso

Class 1200 (Locobase 4892)

The first Pacifics built by Baldwin for the Atchison, Topeka & Santa Fe and described in a 1906 Baldwin catalogue, which is reproduced on http://www.railroadextra.com/blatsf.hmtl . Works numbers were 22628-22630 in August 1903; 22664, 22772, 22779, 22792, 22801, 22822, 22852, 22878, 22889 in September; 22911, 22918, 22941, 22976, 22991, 23008, 23018, 23029, 23055, 23066, 23126 in October; 23136, 23143, 23158 in November.

Although delivered with 69" drivers, they soon were fitted with 79" wheels (although the photograph doesn't show how such large drivers could fit). The 1200s had inside piston valves and motion. All fireboxes had 29.5 sq ft in arch tubes contributing to total firebox heating surface.

See Locobase 8265 for the superheated update.

Retirements began in 1939 and continued until 1950.

Class 1200 - superheated (Locobase 8265)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

This entry is representative of the superheated 1200s, but not exhaustive. All fireboxes had 29.8 sq ft of arch tubes. But in addition to the 30-element, 23 1/2" cylinder, Baker-gear variant shown in the data, the Santa Fe also installed a 28-element superheater (and 174 small tubes vs the 171 of the current variant). At least 4 others (1200, 1212 1219, 1220) kept the inside Stephenson gear and the 22 1/2" cylinders originally supplied, but added a 30-element superheater.

In the late 1920s, 4 of this class -- 1207, 1210, 1214-1215 -- were rebuilt as 2-6-2 Prairies. Locobase wonders why a railroad would make that change.

In any event, the last of the 1200 class was retired in 1950.

Class 1226 (Locobase 4891)

Balanced-compound Pacifics built by Baldwin for the Atchison, Topeka & Santa Fe and described in a 1906 Baldwin catalogue, which is reproduced on http://www.railroadextra.com/blatsf.hmtl . Additional data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema. (Thanks to Chris Hohl for pointing out the later tender weight.)

Works numbers were 26212, 26217-26219, 26250-26251, 26268, 26284, 26301, 26312, 26327, 26342 in August 1905; 26370, 26417, 26434-26435, 26451, 26463-26464, 26484-26485, 26491-26492, 26505-26506. 26533 in September; 26553, 26572, 26629, 26721 in October; 27981, 27994, 28009, 28033, 28035 in April 1906; 28067, 28081, 28147, 28200, 28215 in May; 28322 in June

These were among the first Pacifics to be supplied to the Santa Fe and had the same boilers as the earlier 1200-class simples. They are among the few Pacifics delivered as compounds. Many were simpled beginning in 1918. Later tenders had the same capacities, but weighed 179,000 lb (81,193 kg).

Those that were not, and were scrapped in the 1930s, were:

1932 - June 1232; November 1233;

1933 - August 1254

1934 -July 1234; September 1247, 1252; October 1250; November 1238, 1248-1249; December 1244, 1251

See Locobase 8266 to see the result of simpling and superheating this design.

Class 1226 - superheated (Locobase 8266)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema. (Thanks to Chrish Hohl for pointing out the tender's loaded weight.)

In most respects, this upgrade of the 1226 class was identical to that of the 30-element 1200 superheat modification. The differences stem from the later engine's 73" drivers, which increased the calculated tractive effort.

All fireboxes had 29.8 sq ft of arch tubes.

Class 1270 (Locobase 8267)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. See also DeGolyer, Volume 33, pp204-210. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema. Works numbers in 32164, 32178, 32224, 32263-32265, 32281 in November 1907; 34000-34002, 34031-34034, 34050, 34068-34072 in November 1911; 34098-34102, 34175-34176 in December.

This set of 20 small oil-burning Pacifics was delivered in 1909-1910 and followed a series of relatively big-boilered 4-6-2s. Santa Fe's diagram describes the class as having a "Jacobs" superheater. The specifications pages (particularly 207) give the full details on the split-superheater design that was credited with a total of 1,202 sq ft

Some were later superheated; see Locobase 8268.

Class 1270 - superheated (Locobase 8268)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

Locobase 8267 describes the original, saturated-steam 1270s as they entered service. Some time after 1910, the railroad put in the same 28-element superheater applied to some of the 1200 series. It seems to have been a relatively straightforward update for a class that stayed in service as long as any Pacific.

Retirements began in 1940 and were complete in 1951.

Class 1290 (Locobase 4209)

Sizable Pacifics profiled in Railroad Gazette (27 March 1908). Works numbers were 32164, 32178, 32224, 32263-32265, and 32281 in November 1907.

Using the Baldwin smokebox heater at the front of the long, straight boiler encouraged the lower boiler pressure, although one has to suspect that 20' tube lengths must have meant that the superheater wasn't getting the hottest heat possible.. 13" piston valves were relatively generous for the time.

Retired in 1939-1952.

Class 1297 (Locobase 8269)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection, supplemented by "Atlantic and Pacific Type Engines for the Santa Fe," Railway and Locomotive Engineering, Vol 24, No. 1 (January 1911), pp. 34-35 and Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 37, p 257. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

Works numbers were 35604-35608 in November 1910 and 35682-35684, 35731-35734 in December.

For a long time, Locobase could only guess that these had the unusual Jacobs-inspired firebox and superheater, but the presence of both was confirmed by the RLE article. The former - a Jacobs-Shupert stayless rigid firebox -- is described more fully in Locobase 463. The Buck-Jacobs superheater was a 4-foot long drum that occupied the long boiler barrel ahead of the firetubes. The Baldwin spec says that each of the 417 tubes in the superheater measure 2 5/8" in diameter and were to be "exactly opposite the tubes in boiler" and "The outside shecll of boiler to constitute outside shell of superheater.". Locobase isn't quite sure what tubes matched up with which flues. Moreover, "steam space to be provided at top of superheater by omitting first two rows of flues."

Some of these were later superheated in a more conventional layout; see Locobase 8270.

Class 1297 - superheated (Locobase 8270)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

Locobase 8269 shows the original saturated-steam Pacifics that came to the Santa Fe in 1910. It seems from the current diagram that the Santa Fe superheated the class while retaining the Jacobs Shupert firebox (see Locobase 463 for a description). On the other hand, they deleted the preheater and lengthened the boiler tubes by 3 feet.

One locomotive had a substantially modified firebox of 58 sq ft, but the Santa Fe diagram doesn't show any heating surface areas. The boiler had 20 ft 8 1/8" tubes and flues, 191 of the 2 1/4" small tube variety and 28 5 1/2" flues. The firebox heating surface included 28.8 sq ft in 4 arch tubes.

In that more-conventional configuration, the class operated for several decades. The first of the class retired in 1935, the last in 1950.

Class 1309 (Locobase 8271)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema. Works numbers were 37223-37224, 37279-37282, 37293-37296, 37308-37311 in November 1911; 37315-37318, 37324, 37330-37337 in December.

The Santa Fe had a long-running interest in the Jacobs Shupert stayless firebox and installed it on several classes; see Locobase 463 for a description of this firebox design. Here the installation was combined with a Buck-Jacobs superheater (which was located in the boiler barrel) and a 4-cylinder, balanced-compound layout. A more conventional Schmidt superheater was installed beginning in 1922; See Locobase 8272.

Class 1309 - sh - 26 flues (Locobase 8272)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

Although the Santa Fe kept the Jacobs Shupert firebox and the balanced-compound layout, not long after the 1309s described in their initial configuration in Locobase 827 entered service the railroad pulled out the Buck-Jacobs boiler superheater and replaced with a Schmidt smokebox system. Another version had 165 2 1/4" tubes and 28 5 1/2" flues of slightly shorter length. The firebox heating surface included 28.8 sq ft of arch tubes.

Class 1337 (Locobase 8273)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. See also the very detailed specification at DeGolyer, Volume 46, pp.134-146 and 147-161. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema. Works numbers were

1912

May 37780-37784; June 37859-37866, 37878, 37889-37891, 37934-37936

1913

March 39478-39483; April 39561-39582, 39666-39669

Sticking with the balanced-compound layout for its Pacifics, this large class of Pacifics was delivered with the Schmidt superheater. Firebox heating surface included 28 sq ft of arch tubes. The balanced piston valves measured 15" in diameter.

Most were simpled between 1922 and 1927. See Locobase 451 for the very similar rebuild of the 3500s.

Class 1398 (Locobase 8274)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

A 4-4-6-2 was an oddity on any railroad, although less so for one as adventurous in locomotive design as was the Santa Fe in the early 20th Century. Locobase 420 describes the articulated original and its short career. By 1915, even the AT & SF had to admit the experiment was a failure, so its shops converted one of the engines into 2 Pacifics. As 4-6-2, they were quite successful and operated for decades before being scrapped in 1948 and 1950.

Class 3400 (Locobase 124)

Data from ATSF 9 1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. See also DeGolyer, Vol 61, p. 1. Works numbers were 51390 in February 1919; 51484, 51566, 51593-51594, 51629-51630 in March; 51660-51662 in April; 51784-51785 in May; 51858-51861, 51888-51891 in June;

54948-54952,54978-54979, 54980-54982 in August 1921;

56503, 56598-56601 in May 1923; 56683-56685 in June; 56770-56771 in July;

57674-57677, 57689-57694 in March 1924

(Thanks to Chris Hohl for noticing the 3400's absence from Locobase's section of Wes Barris's http://www.steamlocomotive.com and asking where it had gone. Locobase determined that there was a hiccup in his authoring system that swallowed the index location for the memo file and trashed the entry.)

This was the last class of Pacifics bought by the Santa Fe and like so much of the railroad's stud, came from Baldwin. Similar to the USRA's Heavy Pacific in its tube and flue counts but fitted with a grate close in size to the USRA's Light Pacific and delivered with drivers close in size to the latter, these engines clearly reflected a relatively conservative approach on the part of head of motive power John Purcell.

Forty were delivered as coal burners and were later converted to oil burning, while the last ten burned oil from the beginning.

During the first 15 or so years of service, the class saw few changes. A couple of engines were retrofitted with thermic syphons, Elesco feed water heaters were installed in many engines, and some were fitted with cast steel cylinders, but the only class-wide difference over the years was the trailing of a tender that carried 20,000 US gallons (75,700 litres) of water. The oil burners' tenders had 7,000 gallons of fuel oil (26,495 litres).

Then all but six of the class were completely rebuilt beginning in 1936; see Locobase 15875.

Class 3400-rebuilt (Locobase 15875)

Data from diagram 201-B1, archived at the Kansas Historical Societies Kansas Memory website at http://www.kansasmemory.org/item/221763/page/233, last accessed 1 July 2014.

Locobase 124 shows the 3400 class as delivered. The entry notes that the Santa Fe changed little in these engines for almost 20 years after they entered service. But beginning in June 1936, the railroad essentially rebuilt almost the entire class. Although fewer and shorter small tubes fit in the new boiler, the flue count remained the same. The firebox, which now burned oil in all engines, added AA security circulators and a short combustion chamber.

A Commonwealth cast-steel bed cast integrally with the cylinders supported higher axle loadings and taller Boxpok drivers turning in Timken roller bearings.

After their makeover, the last of which was completed in 1947, the class served the Kansas City-La Junta, Newton (Kan)-Galveston (Tex), and Newton-Clovis (NM) divisions until their retirements in the mid-1950s.

Class 3500 (Locobase 3174)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema. See also "Santa Fe Balanced Compound Pacific Locomotive," Railway Age Gazette (19 June 1914), pp. 1519-1520 and Works numbers were 41181-41190, 41203-41212 in February 1914 and 41230-41239, 41247-41251 in March

Firebox heating surface included 29.5 sq ft of firebrick tubes.

Data in this entry is for these engines as four-cylinder balanced Vauclain compounds, of which this was the latest version. A significant, if invisible, change was to raise the inside HP cylinders above the line of outside LP cylinders and to angle them down. The main rod of the cylinder thus passed over the front axle to drive the second axle and the need for a bifurcated rod went away. The grates varied because 20 burned bituminous coal, one burned lignite, and 14 burned oil. Coal burners had brick arches and power-operated shakers, the oilers uesd a Booth burner design placed in the front of the firebox.

NB: The Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 50, pp. 1-66, go into excruciating detail on all three variants.

The engines also introduced the use of Baker outside radial valve gear driving the 15" piston valve on each side that admitted steam to the pair (1 HP, 1 LP) of cylinders.

See 451 for simpled rebuilds.

Class 3500 - simpled (Locobase 451)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema.

Firebox heating surface included 29 sq ft of firebrick tubes. Locobase 3174 shows the four-cylinder balanced compounds that entered service in 1914. These were simpled a few years later as shown in the current entry. Interestingly, about the only change was the deletion of two cylinders and the replacement of the HP cylinders with these larger-diameter jugs.

Retired in 1940-1955.

Class 3600 (Locobase 123)

Data from DeGolyer, Vol 51, pp. 1+ . One example built for the 1915 San Francisco exposition. Works number was 41812 in December 1914.

The boiler is considerably bigger than earlier Santa Fe Pacifics, as is the grate area. One account described it as "omnivorous", being convertible from oil to coal and vice versa with a few changes.

Scrapped in December 1938.


Specifications by Steve Llanso
Class12001200 - superheated12261226 - superheated12701270 - superheated129012971297 - superheated13091309 - sh - 26 flues1337139834003400-rebuilt35003500 - simpled3600
Locobase ID4892 8265 4891 8266 8267 8268 4209 8269 8270 8271 8272 8273 8274 124 15875 3174 451 123
RailroadSanta Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)Santa Fe (ATSF)
CountryUSAUSAUSAUSAUSAUSAUSAUSAUSAUSAUSAUSAUSAUSAUSAUSAUSAUSA
Whyte4-6-24-6-24-6-24-6-24-6-24-6-24-6-24-6-24-6-24-6-24-6-24-6-24-6-24-6-24-6-24-6-24-6-24-6-2
Road Numbers1200-12251200-12251226-126612261270-12891270-12891290-12961297-13081297-13081309-13361309-13361337-13881398-13993400-344934003500-35343500-35343600
GaugeStdStdStdStdStdStdStdStdStdStdStdStdStdStdStdStdStdStd
BuilderBurnham, Williams & CoSanta FeBurnham, Williams & CoSanta FeBaldwinSanta FeBurnham, Williams & CoBaldwinSanta FeBaldwinSanta FeBaldwinSanta FeBaldwinBaldwinBaldwinSanta FeBaldwin
Year190319141905191819091920190719101916191119181912191519191936191419211914
Valve GearStephensonBakerStephensonWalschaertWalschaertWalschaertWalschaertWalschaertWalschaertWalschaertWalschaertWalschaertWalschaertWalschaertWalschaertBakerWalschaertBaker
Locomotive Length and Weight
Driver Wheelbase13.67'13.67'13.67'13.67'12.67'12.67'12.67'12.67'12.67'13.67'13.67'13.67'12.67'13.67'13.67'13.67'13.67'13.66'
Engine Wheelbase33.80'33.80'34'34'34.40'34.40'34.42'35.17'35.17'35.08'35.08'35.08'33.92'35.25'35.25'35.08'35.25'
Ratio of driving wheelbase to overall engine wheebase 0.40 0.40 0.40 0.40 0.37 0.37 0.37 0.36 0.36 0.39 0.39 0.39 0.37 0.39 0.39 0.39 0.39
Overall Wheelbase (engine & tender)62.87'66.85'66.12'67.75'65.17'65.17'65'67.02'67.02'66.98'66.98'66.98'69.96'72.06'83.88'70.56'71.70'
Axle Loading (Maximum Weight per Axle)51700 lbs57300 lbs52900 lbs54700 lbs53500 lbs53500 lbs53500 lbs53500 lbs55460 lbs54980 lbs58780 lbs55590 lbs61350 lbs70800 lbs60100 lbs
Weight on Drivers147400 lbs168100 lbs151900 lbs162700 lbs156500 lbs156500 lbs140400 lbs150500 lbs150500 lbs160900 lbs162760 lbs168740 lbs161270 lbs179550 lbs205100 lbs172300 lbs168480 lbs172550 lbs
Engine Weight214600 lbs253100 lbs226700 lbs244280 lbs235400 lbs235400 lbs232750 lbs240550 lbs240550 lbs276500 lbs278840 lbs284230 lbs269390 lbs300950 lbs338900 lbs289850 lbs280080 lbs284700 lbs
Tender Light Weight135400 lbs138800 lbs160300 lbs185400 lbs179000 lbs179000 lbs162250 lbs168605 lbs168605 lbs185400 lbs185400 lbs186900 lbs221000 lbs233720 lbs396426 lbs221000 lbs221000 lbs212800 lbs
Total Engine and Tender Weight350000 lbs391900 lbs387000 lbs429680 lbs414400 lbs414400 lbs395000 lbs409155 lbs409155 lbs461900 lbs464240 lbs471130 lbs490390 lbs534670 lbs735326 lbs510850 lbs501080 lbs497500 lbs
Tender Water Capacity7000 gals8500 gals8500 gals9000 gals8500 gals8500 gals8500 gals8500 gals8500 gals9000 gals9000 gals9000 gals10000 gals12000 gals20000 gals10000 gals10000 gals10000 gals
Tender Fuel Capacity (oil/coal)3300 gals10 tons3300 gals3428 gals3300 gals3300 gals3300 gals3300 gals3300 gals3300 gals3300 gals3300 gals3300 gals16 tons8000 gals3300 gals3300 gals3300 gals
Minimum weight of rail (calculated) on which locomotive could run82 lb/yard93 lb/yard84 lb/yard90 lb/yard87 lb/yard87 lb/yard78 lb/yard84 lb/yard84 lb/yard89 lb/yard90 lb/yard94 lb/yard90 lb/yard100 lb/yard114 lb/yard96 lb/yard94 lb/yard96 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter69"79"73"73"73"73"73"73"73"73"73"73"73"74"79"73"73"80"
Boiler Pressure220 psi200 psi220 psi200 psi210 psi210 psi160 psi210 psi210 psi210 psi210 psi210 psi200 psi200 psi220 psi210 psi220 psi200 psi
High Pressure Cylinders (dia x stroke)22.5" x 28" (2)23.5" x 28" (2)17" x 28" (2)23.5" x 28" (2)23.5" x 28" (2)23.5" x 28" (2)25" x 28" (2)23.5" x 28" (2)23.5" x 28" (2)17.5" x 28" (2)17.5" x 28" (2)17.5" x 28" (2)23.5" x 28" (2)25" x 28" (2)25" x 28" (2)17.5" x 28" (2)23.5" x 28" (2)26" x 26" (2)
Low Pressure Cylinders (dia x stroke)28" x 28" (2)29" x 28" (2)29" x 28" (2)29" x 28" (2)29" x 28" (2)
Tractive Effort38416 lbs33275 lbs30292 lbs36010 lbs37810 lbs37810 lbs32603 lbs37810 lbs37810 lbs30741 lbs30741 lbs30741 lbs36010 lbs40203 lbs41424 lbs30741 lbs39611 lbs37349 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.84 5.05 5.01 4.52 4.14 4.14 4.31 3.98 3.98 5.23 5.29 5.49 4.48 4.47 4.95 5.60 4.25 4.62
Heating Ability
Firebox Area222.60 sq. ft222.60 sq. ft222.60 sq. ft222.60 sq. ft190 sq. ft190 sq. ft190 sq. ft208 sq. ft208 sq. ft220 sq. ft224.60 sq. ft228 sq. ft237.50 sq. ft269 sq. ft329.60 sq. ft238.50 sq. ft238.50 sq. ft232 sq. ft
Grate Area53.50 sq. ft53.50 sq. ft53.40 sq. ft53.50 sq. ft49.50 sq. ft49.50 sq. ft49.50 sq. ft48.20 sq. ft48.20 sq. ft57.64 sq. ft59.64 sq. ft57.60 sq. ft60.10 sq. ft66.80 sq. ft66.80 sq. ft57.60 sq. ft57.60 sq. ft66.70 sq. ft
Evaporative Heating Surface3595 sq. ft3089 sq. ft3595 sq. ft3089 sq. ft3071 sq. ft2963 sq. ft3392 sq. ft2926 sq. ft2740 sq. ft3308 sq. ft3206 sq. ft3463 sq. ft3764 sq. ft4109 sq. ft3329 sq. ft3474 sq. ft3473 sq. ft4443 sq. ft
Superheating Surface701 sq. ft701 sq. ft654 sq. ft759 sq. ft1143 sq. ft742 sq. ft812 sq. ft659 sq. ft742 sq. ft912 sq. ft980 sq. ft917 sq. ft742 sq. ft742 sq. ft980 sq. ft
Combined Heating Surface3595 sq. ft3790 sq. ft3595 sq. ft3790 sq. ft3071 sq. ft3617 sq. ft4151 sq. ft4069 sq. ft3482 sq. ft4120 sq. ft3865 sq. ft4205 sq. ft4676 sq. ft5089 sq. ft4246 sq. ft4216 sq. ft4215 sq. ft5423 sq. ft
Evaporative Heating Surface/Cylinder Volume279.00219.76488.73219.76218.48210.80213.23208.16194.93424.38411.29444.27267.78258.30209.27445.68247.08278.09
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11770107001174810700103951039579201012210122121041252412096120201336014696120961267213340
Same as above plus superheater percentage11770126261174812626103951226693461295612248145251465414273144241589817929142731495315741
Same as above but substitute firebox area for grate area489725253448972525343990047082358725591052853554405518456498570006402288465591006191554752
Power L1924419692631518196730917812136722590819009139841224613465227812213324090135412160124073
Power MT414.78774.78274.96739.68308.89752.75644.051138.55835.37574.82497.62527.77934.27815.29776.83519.78847.97922.72

Photos

Reference

Credits

Introduction and roster provided by Richard Duley. Class details and specifications provided by Steve Llanso of Sweat House Media.