San Pedro, Los Angeles & Salt Lake / St.Joseph & Grand Island / Oregon-Washington RR & Navigation / Union Pacific 4-4-0 "American" Type Locomotives

Data from Angus Sinclair, "Ratio of Heating Surface to Grate Area and Cylinder Volume," Railway and Locomotive Engineering (Volume 10, 1897), pp. 316-318.

The builder's date is an estimate.

Class 15 (Locobase 6572)

Data from 1914 ST J & GI locomotive diagram supplied in May 2005 by Allen Stanley from his extensive collection.

Weight data is the best reading from the diagram, but cannot be confirmed fully. Cooke's works numbers were 1361-1363.

Class 20 (Locobase 6573)

Data from 1914 ST J & GI locomotive diagram supplied in May 2005 by Allen Stanley from his extensive collection.

The diagram tells us that the data reflects the St J & GI's rebuild in 1890. Taunton delivered the original in 1874 as works #20.

Class 21 (Locobase 6574)

Data from 1914 ST J & GI locomotive diagram supplied in May 2005 by Allen Stanley from his extensive collection.

The diagram tells us that the data reflects the St J & GI's rebuild in 1893. Taunton delivered the original in 1874 as works #41. The 1893 makeover yielded a locomotive identical in its principal areas and dimensions to the Baldwin Moguls of 1885 (see Locobase 6576).

Class 22 (Locobase 6575)

Data from 1914 ST J & GI locomotive diagram supplied in May 2005 by Allen Stanley from his extensive collection.

Cooke's works number was 1767. This Eight-wheeler was a slight enlargement of the 15 class that had arrived a year earlier.

Class 600 / 900 (Locobase 5088)

Data from Union Pacific locomotive diagram drawn up in September 1898 as reproduced in the National Park Service's study of Steamtown's #737. According to the report, #737 was delivered in 1887 "...as part of one of the largest locomotive orders on record up to that date.." although the total for the class isn't given. http://utahrails.net/up/steam/up-steam-1885-1915.php

(visited 14 July 2005) gives details of builder's numbers:

8372, 8375, 8381-8424.

As delivered, the engine had a shallow diamond stack, long "cowcatcher" with vertical bars and plain, squared domes for sand and steam.

A comparison with other Locobase 4-4-0s of similar vintage shows that while the 600 class was in the middle of the pack in terms of heating surface and offered a relatively small grate, it had a deep firebox with lots of area. Taken all in all, it's highly representative of a dual-service eight-wheeler of the era.

Over the years, those members of the class that remained with the Union Pacific were refitted with an extended smokebox and "shotgun" stack. The NPS report does not give details on when the last member of the class was retired from the UP. See the report for 737's extended operating life with the Southern Pacific and the Erath & Vermilion Sugar Companies in Vermilion Bayou.

Class 780 (Locobase 2154)

Data from 1899 Brooks catalogue.

Builder info from B.Rumary, 25 Kingscombe, Gurney Slade, Radstock, BA3 4TH, ENGLAND and Jeremy Lambert as supplied by Allen Stanley in March 2004. Works #1380-1389, produced in June 1888.

Classic '80s American with coned boiler topped by smallish steam dome just ahead of large wooden cab.

Most of the class saw out their days on the Union Pacific. 1383 went to affiliate Fort Worth & Denver as their 39 and 1380 followed as #40. 1382 was sold to Texas & New Orleans RR as that line's 247; it was renumbered 217 later on. And 1386 eventually served the Chicago, Memphis & Gulf as #3.

Class 807 / 931 (Locobase 7440)

Data from 1918 Union Pacific Locomotives & Tenders diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Based on the 737 shown in Locobase 5088, this class shared many components with that class. Two differences were the shorter boiler tubes and the taller drivers. Taunton delivered locomotives with two different strokes; some as shown and others lengthened to 26".

Class 831 (Locobase 6585)

Data from 1897 Union Pacific Locomotives & Tenders Folio 200 supplied in May 2005 by Allen Stanley from his extensive collection.

The date is an estimated based on the known date of "842", shown in Locobase 6586.

Class 842 (Locobase 6586)

Data from 1897 Union Pacific Locomotives & Tenders Folio 200 supplied in May 2005 by Allen Stanley from his extensive collection.

Boiler pressure is an estimate, based on similar locomotives operated by the UP in the same period. (See Locobase 5088, 6585)

Class 932 - superheated (Locobase 8334)

Data from UP 10 - 1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

Locobase is surprised to see that the Union Pacific went to the trouble of superheating this collection of 1880s Eight-wheelers. Indeed, the small scale of the superheater was apparently unrivalled in North American railroading. Some British 4-4-0s featured boilers of similar size with even less superheater area, but an American on the American prairies running with such a small superheater was a novelty. Moreover, the usual practice in such small locomotives was to install flues measuring 5 3/8" in diameter; the UP engines had 5 1/2" flues.

On the other hand, one does see the usual gain in performance for what was obviously a niche service.

Class CV 70 / E-70 (Locobase 7261)

Data from SPLA&SL Locomotive Diagram book (the Salt Lake Route) supplied in May 2005 by Allen Stanley from his extensive collection.

Originally delivered to the Los Angeles Terminal Company, this Eight-wheeler then came under the LASL rubric. A solo engine, it carried until its retirement in 1925.

Class E-45 (Locobase 7834)

Data from OWRR&NCo 1 - 1930 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

Locobase doesn't know what part of the OWRR & N's system was narrow gauge or for how long. But here was this little Eight-wheeler in the 1930 book.

Class E-64 (Locobase 7835)

Data from OWRR&NCo 1 - 1930 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

It's interesting to compare this Eight-wheeler to the narrow-gauger that was a decade older (see Locobase 7834). Most of the dimensions are not strikingly bigger in each dimension, but taken as a whole, you have a locomotive that was twice as powerful and ran on the standard gauge.

Class Seminole (Locobase 104)

To Alfred Bruce, former director of steam engineering for Alco, "the design ...with its deep firebox dropped down between the frames and the driving axles was typical ...of all the 20,000 engines of the 4-4-0 type built ...between 1840 and 1890." (Bruce, 1950).

Specifications
Class		15	20	21	22	600 / 900	780	807 / 931	831	842	932 - superheated	CV 70 / E-70	E-45	E-64	Seminole
Locobase ID	9716	6572	6573	6574	6575	5088	2154	7440	6585	6586	8334	7261	7834	7835	104
Railroad	Union Pacific	St.Joseph & Grand Island (UP)	St.Joseph & Grand Island (UP)	St.Joseph & Grand Island (UP)	St.Joseph & Grand Island (UP)	Union Pacific (UP)	Union Pacific (UP)	Union Pacific (UP)	Union Pacific (UP)	Union Pacific (UP)	Union Pacific (UP)	San Pedro, Los Angeles & Salt Lake (UP)	Oregon-Washington RR & Navigation (UP)	Oregon-Washington RR & Navigation (UP)	Union Pacific (UP)
Whyte	4-4-0	4-4-0	4-4-0	4-4-0	4-4-0	4-4-0	4-4-0	4-4-0	4-4-0	4-4-0	4-4-0	4-4-0	4-4-0	4-4-0	4-4-0
Road Numbers		15-17 /	20	21	22	692-694, 726-750	780-789	807-819 / 931-940	831-840	842	932, 942, 945, 947	8 / 1050	1	115
Gauge	Std	Std	Std	Std	Std	Std	Std	Std	Std	Std	Std	Std	3'	Std	Std
Builder	shops	Cooke	Taunton	Taunton	Cooke	several	Brooks	Taunton			UP	Alco-Schenectady			Rogers
Year	1890	1884	1890	1893	1885	1887	1888	1875	1885	1886	1920	1901	1880	1890	1867
Valve Gear	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson
	Locomotive Length and Weight
Driver Wheelbase		8'	9.50'	9.50'	8.75'	8.83'	8.83'	8.83'	8.83'	8.83'	8.83'	8.50'	8.17'	9.08'	7.75'
Engine Wheelbase		22.71'	25.04'	25.04'	23.43'	24.75'	24.75'	23.79'	23.79'	23.71'	23.79'	23.42'	20.06'	24.67'	23'
Ratio of driving wheelbase to overall engine wheebase		0.35	0.38	0.38	0.37	0.36	0.36	0.37	0.37	0.37	0.37	0.36	0.41	0.37	0.34
Overall Wheelbase (engine & tender)		45.08'	47.04'	47.04'	52.10'		46.23'					49.35'	41.40'	46.83'
Axle Loading (Maximum Weight per Axle)	0					32000 lbs		31200 lbs			38900 lbs		16500 lbs	34300 lbs
Weight on Drivers	81025 lbs	55980 lbs	69500 lbs	69500 lbs	60500 lbs	62000 lbs	63000 lbs	58400 lbs	70000 lbs	69300 lbs	76170 lbs	81050 lbs	33000 lbs	68600 lbs	42000 lbs
Engine Weight	119000 lbs	89660 lbs	112500 lbs	125000 lbs	98100 lbs	99000 lbs	100000 lbs	94100 lbs	105800 lbs	107000 lbs	113370 lbs	127450 lbs	50400 lbs	109900 lbs	62000 lbs
Tender Light Weight	0		108000 lbs	108000 lbs	108000 lbs	70500 lbs	70000 lbs	107233 lbs		107233 lbs	98233 lbs		48166 lbs	91816 lbs
Total Engine and Tender Weight	0	0	220500 lbs	233000 lbs	206100 lbs	169500 lbs	170000 lbs	201333 lbs	0	214233 lbs	211603 lbs	0	98566 lbs	201716 lbs	0
Tender Water Capacity	0	3400 gals	5280 gals	5280 gals	5280 gals	2900 gals	2900 gals	4000 gals		9000 gals	4000 gals	5500 gals			2000 gals
Tender Fuel Capacity (oil/coal)	0	9 tons	9 tons	10 tons	11 tons	8 tons	6 tons	14 tons	tons	14 tons	9.5 tons	1784 gals	gals	gals	2 tons
Minimum weight per yard of rail on which locomotive could run	68 lb rail	47 lb rail	58 lb rail	58 lb rail	50 lb rail	52 lb rail	53 lb rail	49 lb rail	58 lb rail	58 lb rail	63 lb rail	68 lb rail	28 lb rail	57 lb rail	35 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	69"	63"	63"	63"	63"	62"	63"	69"	69"	69"	69"	70"	49"	64"	54"
Boiler Pressure	180 psi	150 psi	155 psi	155 psi	155 psi	160 psi	150 psi	160 psi	160 psi	160 psi	160 psi	175 psi	115 psi	150 psi	130 psi
Cylinders (dia x stroke)	19" x 24"	17" x 24"	17.5" x 24"	18" x 24"	18" x 24"	18" x 26"	18" x 26"	18" x 24"	18" x 26"	18" x 26"	17" x 26"	19" x 24"	14" x 18"	18" x 26"	16" x 22"
Tractive Effort	19211 lbs	14037 lbs	15371 lbs	16262 lbs	16262 lbs	18478 lbs	17049 lbs	15327 lbs	16604 lbs	16604 lbs	14810 lbs	18411 lbs	7038 lbs	16782 lbs	11525 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.22	3.99	4.52	4.27	3.72	3.36	3.70	3.81	4.22	4.17	5.14	4.40	4.69	4.09	3.64
	Heating Ability
Firebox Area	143.30 sq. ft	92 sq. ft	121 sq. ft	121 sq. ft	106 sq. ft	141.70 sq. ft	111 sq. ft	141.70 sq. ft	110.60 sq. ft	141.70 sq. ft	141.70 sq. ft	150 sq. ft	83.50 sq. ft	122.10 sq. ft
Grate Area	26.20 sq. ft	15.40 sq. ft	16.40 sq. ft	16.40 sq. ft	16.50 sq. ft	16.71 sq. ft	17.55 sq. ft	16.71 sq. ft	16.50 sq. ft	16.71 sq. ft	17.20 sq. ft	26.90 sq. ft	10.10 sq. ft	18.50 sq. ft	14.50 sq. ft
Evaporative Heating Surface	1816	1068	1371	1395	1076	1448	1426	1348	1325	1348	1045	2063	708	1385	980
Superheating Surface	0										192
Combined Heating Surface	1816	1068	1371	1395	1076	1448	1426	1348	1325	1348	1237	2063	708	1385	980
Evaporative Heating Surface/Cylinder Volume	230.58	169.39	205.20	197.35	152.22	189.09	186.22	190.70	173.03	176.03	152.99	261.94	220.76	180.87	191.42
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	4716	2310	2542	2542	2558	2674	2633	2674	2640	2674	2752	4708	1162	2775	1885
Same as above plus superheater percentage	4716	2310	2542	2542	2558	2674	2633	2674	2640	2674	3302	4708	1162	2775	1885
Same as above but substitute firebox area for grate area	25794	13800	18755	18755	16430	22672	16650	22672	17696	22672	27206	26250	9603	18315	0
Power L1	6656	3817	4813	4605	3698	4656	4074	5353	4513	4941	9379	7292	3296	4169	0
Power MT	362.21	300.64	305.35	292.15	269.51	331.12	285.13	404.16	284.27	314.37	542.92	396.70	440.39	267.96	0