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Specifications
Specifications
Configuration:;
• Whyte	2-8-8-4
• UIC	(1′D)D2′
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	63 in (1,600 mm)
Wheelbase	113.49 ft 6.7 in (34.76 m)
Axle load	70,032 lb (31,766 kilograms; 31.766 metric tons)
Adhesive weight	560,257 lb (254,128 kg; 254.128 t)
Loco weight	695,040 lb (315,260 kg; 315.26 t)
Tender weight	438,000 lb (199,000 kg; 199 t)
Total weight	1,133,040 lb (513,940 kg; 513.94 t)
Fuel type	Coal
Fuel capacity	26 short tons (24 t; 23 long tons)
Water cap.	25,000 US gal (95 m3)
Fuel consumption	10 t (9.8 long tons; 11 short tons) to 12 t (12 long tons; 13 short tons) of coal per hour; 12,000 US gal (45,000 L; 10,000 imp gal) of water per hour
Firebox:
• Grate area	125 sq ft (11.6 m2)
Boiler	108 in (2,743 mm)
Boiler pressure	240 psi (1.7 MPa)
Cylinders	Four
Cylinder size	26 by 32 in (660 by 813 mm)

Type and origin
Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Build date	1941 (8) 1943 (10)
Total produced	18

DM&IR Yellowstones
DM&IR Yellowstones
	DM&IR 227 at the Lake Superior Railroad Museum.
Power type
Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Build date	1941 (8) 1943 (10)
Total produced	18
Configuration:;
Specifications
Configuration:;
• Whyte	2-8-8-4
• UIC	(1′D)D2′
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	63 in (1,600 mm)
Wheelbase	113.49 ft 6.7 in (34.76 m)
Axle load	70,032 lb (31,766 kilograms; 31.766 metric tons)
Adhesive weight	560,257 lb (254,128 kg; 254.128 t)
Loco weight	695,040 lb (315,260 kg; 315.26 t)
Tender weight	438,000 lb (199,000 kg; 199 t)
Total weight	1,133,040 lb (513,940 kg; 513.94 t)
Fuel type	Coal
Fuel capacity	26 short tons (24 t; 23 long tons)
Water cap.	25,000 US gal (95 m3)
Fuel consumption	10 t (9.8 long tons; 11 short tons) to 12 t (12 long tons; 13 short tons) of coal per hour; 12,000 US gal (45,000 L; 10,000 imp gal) of water per hour
Firebox:
• Grate area	125 sq ft (11.6 m2)
Boiler	108 in (2,743 mm)
Boiler pressure	240 psi (1.7 MPa)
Cylinders	Four
Cylinder size	26 by 32 in (660 by 813 mm)
Maximum speed
Performance figures
Maximum speed	45 mph (72 km/h) (limited with ore trains)
Power output	6,250 hp (4,660 kW) @ about 40 mph
Tractive effort	140,093 lbf (623.16 kN)
Factor of adh.	4.00
Operators
Career
Operators	Duluth, Missabe & Iron Range Railway (DM&IR)
Class	M-3, M-4
Numbers	220–237
Retired	1958-1963
Preserved	3 (225, 227 & 229)
Disposition	Three preserved and on display, remainder scrapped.

A 2-8-8-4 steam locomotive, under the Whyte notation, has two leading wheels, two sets of eight driving wheels, and a four-wheel trailing truck. The type was generally named the Yellowstone, a name given it by the first owner, the Northern Pacific Railway, whose lines ran near Yellowstone National Park. Seventy-two Yellowstone-type locomotives were built for four U.S. railroads.

Other equivalent classifications are:

UIC classification: 1DD2 (also known as German classification and Italian classification)
French classification: 140+042
Turkish classification: 45+46
Swiss classification: 4/5+4/6
Russian classification: 1-4-0+0-4-2

The equivalent UIC classification is, refined for simple articulated locomotives, (1′D)D2′.

A locomotive of this length must be an articulated locomotive. All Yellowstones had fairly small drivers of 63 to 64 inches (1.60 to 1.63 m). (For greater speeds, the Union Pacific Railroad chose a four-wheel leading truck and drivers of 68 inches (1.73 m) for its Big Boy 4-8-8-4 class.)

Several classes of Yellowstone, especially the Duluth, Missabe and Iron Range's locomotives, are among the largest steam locomotives, with the exact ranking depending on the criteria used.

Northern Pacific

The Northern Pacific Railway was the first railroad to order a 2-8-8-4. The first was built in 1928 by American Locomotive Company; at the time, it was the largest locomotive ever built. It had the largest firebox ever applied to a steam locomotive, some 182 square feet (16.9 m²) in area, to burn Rosebud coal, a cheap low-quality coal. But the firebed was too large for the available draft and the fire burned poorly and developed under 5,000 horsepower. The problem was mitigated by blocking off the first few feet of the grates. Baldwin Locomotive Works built 11 more for the Northern Pacific in 1930. No examples have been preserved.

Southern Pacific

The Southern Pacific Railroad's famous "cab forward" articulated steam locomotives were effectively a Yellowstone in reverse (4-8-8-2). This was done to spare the crew from the heavy smoke output of the large engines on the former Central Pacific, where tunnels and snow sheds were common and lengthy. One is on display at the California State Railroad Museum in Sacramento. The ready availability of fuel oil in California made them possible. The SP also owned some conventional 2-8-8-4s for use in areas where coal was plentiful and snow sheds were rare. Lima Locomotive Works built 12 AC-9 class locomotives in 1939; they had skyline casings with striped pilots. At first, they burned coal but were later converted to oil. None were saved.

Duluth, Missabe and Iron Range

The Duluth, Missabe and Iron Range Railway hauled iron ore in Minnesota. Iron ore is heavy and the DM&IR operated long trains of ore cars, requiring maximum power. These locomotives were based upon ten 2-8-8-2s that Baldwin had built in the 1930s for the Western Pacific Railroad. The need for a larger, coal-burning firebox and a longer, all-weather cab led to the use of a four-wheel trailing truck, giving them the "Yellowstone" wheel arrangement. They were the most powerful Yellowstones built, producing 140,000 lbf (620 kN) of tractive effort, and had the most weight on drivers so that they were less prone to slipping.

Eight locomotives (class M-3) were built by Baldwin in 1941. The Yellowstones met or exceeded the DM&IR specifications, so 10 more were ordered (class M-4). The second batch was completed in late 1943 after the Missabe's seasonal downturn in ore traffic, so some of the new M-4s were leased to and delivered directly to the Denver and Rio Grande Western Railroad.

The next winter, the D&RGW again leased the DM&IR's Yellowstones as helpers over Tennessee Pass, Colorado, and for other freight duties. The Rio Grande returned the Yellowstones after air-brake failure caused No. 224 to wreck on the Fireclay Loop.^[1]^{[page needed]} This was despite the Rio Grande's earlier assessment that these Yellowstones were the finest engines ever to operate there.

DM&IRs were the only Yellowstones to have a high-capacity pedestal or centipede tender, and had roller bearings on all axles. Some of the locomotives had a cylindrical Elesco feedwater heater ahead of the smoke stack, while others had a Worthington unit with its rectangular box in the same location.

Only one Yellowstone was retired before dieselization took place on the Missabe; No. 237 was sold for scrap after a wreck. The rest of the 2-8-8-4s were retired between 1958 and 1963 as diesel locomotives took over.

Of the eighteen built, three survive and are on display in Minnesota: No. 225 at Proctor, No. 227 at the Lake Superior Railroad Museum in Duluth and No. 229 at Two Harbors.

Baltimore and Ohio

B&O EM-1 2-8-8-4 Yellowstone

Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Build date	1944 (20) 1945 (10)
Total produced	30

Specifications
Configuration:
• Whyte	2-8-8-4
• UIC	(1′D)D2′
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	30 in (762 mm)
Driver dia.	64 in (1,626 mm)
Trailing dia.	38 in (965 mm)
Wheelbase	81 ft 6.7 in (24.86 m)
Length	Locomotive: 83 ft 2.9 in (25.37 m) Overall: 128 ft 8 in (39.22 m)
Width	11 ft (3.353 m)
Height	16 ft (4.877 m)
Adhesive weight	485,000 lb (220,000 kg; 220 t)
Loco weight	627,000 lb (284,000 kg; 284 t)
Tender weight	328,000 lb (149,000 kg; 149 t)
Total weight	1,010,700 lb (458,400 kg; 458.4 t)
Fuel type	Coal
Fuel capacity	25 short tons (23 t; 22 long tons)
Water cap.	22,000 US gal (83 m³)
Firebox:
• Grate area	117.5 sq ft (10.92 m²)
Boiler	100 in (2.54 m) dia.
Boiler pressure	235 psi (1.62 MPa)
Feedwater heater	Worthington
Heating surface:
• Firebox	228 by 96 in (5.79 by 2.44 m) with a 90 in (2.29 m) long combustion chamber
Superheater	Type "E"
Cylinders	Four
Cylinder size	24 by 32 in (610 by 813 mm)

Performance figures
Power output	6,000 hp (4,500 kW)
Tractive effort	115,000 lbf (510 kN)
Factor of adh.	4.22

Career
Operators	Baltimore and Ohio Railroad (B&O)
Class	EM-1
Numbers	7600–7629 later 650–679
Last run	April 19, 1960
Disposition	All thirty scrapped by 1961

When the U.S. entered World War II The American railroads saw increases in traffic. The Baltimore and Ohio Railroad, along with other railroads, wanted to purchase more of the diesel locomotives since they were showing improved performance over steam locomotives. But the War Production Board regulated the production of steam and diesel locomotives until the war emergency was over. So, along with producing 40 new class T-3 4-8-2 type locomotives built in-house at its Mt. Clare shops in Baltimore, Maryland, the B&O took delivery of 30 class EM-1 Yellowstones in 1944 and 1945, the largest number and the smallest of this type built by Baldwin as well as the most modern.

The EM-1 produced 115,000 pounds-force (510 kN) of tractive effort on 64-inch (1.6 m) drivers with 235 pounds per square inch (1.62 MPa) steam pressure and four 24-by-32-inch (0.61 by 0.81 m) cylinders. The tender carried 22,000 US gallons (83 m³) of water and 25 tons of coal. The engine weighed 627,000 pounds (284 t) while the tender weighed 328,000 pounds (149 t) for a combined 1,010,700 pounds (458.4 t). Nothing bigger could operate within the tunnel clearances and track restrictions on the B&O's main line.

They were equipped with the newest technology, including the Worthington feedwater heater, superheater with front-end throttle, Cyclone front end, thermic syphons, a lateral cushioning device in the front pair of drivers on both engines and the front wheels and the trailing truck, as well as roller bearings on all axles, engine and tender, which gave them the reputation of "yard creepers", because three men could move one on a level track with the cylinder cocks open.

B&O's president, Roy B. White, after inspecting the first one delivered, said to the general superintendent of motive power and equipment, A.K. Galloway, "Well, I must say, they have everything!"

Fleet numbers 7600–7619 were built and delivered in 1944 and 7620–7629 in 1945, all by the Baldwin Locomotive Works of Philadelphia, Pennsylvania. They went to work on the Cumberland Division's rugged West End subdivision with its more than 2% grades and tight curves, where with the older 2-8-8-0 EL classes, they hauled West Virginia coal and freights. Since the EM-1s had roller bearings throughout, they also handled mail and express trains, replacing two B&O class T-3 4-8-2 Mountains. That continued until January 21, 1947, when, near Oakland, Maryland, train 29 with engine 7625 derailed with the locomotive rolling onto the engineer's side, killing the engineer. The EM-1s were then restricted to coal and freight trains until the late 1950s, when the B&O used EM-1 No. 7600 for railfan trips.^[2]^{[page needed]}

The EM-1s also ran on the Pittsburgh Division over Sand Patch Grade near Meyersdale, Pennsylvania, with empty hoppers, iron ore or dolomite loads westbound, coal eastbound, as well as general freight in both directions. In the late 1950s, the B&O used EM-1 No. 7600 for railfan trips mostly between Cumberland, MD, and Connellsville, PA. Well-known photographer and Cumberland, MD native William P. Price captured, on still pictures and 8mm films, the EM-1s on the east side of Sand Patch pulling heavy trains with two of the B&O's 2-10-2 class S1 and S1a Big Sixes on the rear as helpers dispatched from Hyndman, PA.

Near the end of steam they were all sent out to Fairmont and Wheeling, West Virginia, and Lorain, Ohio, with lake-bound coal trains as well as runs between Willard, OH and Garrett, Indiana, until the B&O started to retire them in 1957, and all of them were scrapped. Two locomotives were formerly preserved. No. 650 (7600) has earmarked for preservation by the B&O Railroad Museum in Baltimore. However, a yard master who completely misunderstood why it has to be moved, thought it was supposed to be scrapped, and the yard master ordered No. 650 to the scrapyard and broken up. As a result, he was fired by them for being a moron. No. 659 (7609) was offered to the city of Wheeling, West Virginia, for static display, but they denied the offer, and broken up. Thus, none of the EM-1s survive today.

Outside the United States

The metre-gauge Central Railway of Brazil took delivery of four 2-8-8-4s from the German firm of Henschel in 1937. They were the only narrow gauge locomotives of this wheel arrangement. They had the largest boilers ever used on a narrow-gauge simple expansion locomotive.

Soviet Russia constructed two 2-8-8-4 locomotives at the Kolomna Locomotive Works. These were the P38 Class numbers P38.001 and P38.002. The first locomotive carried partial casings over the boiler and smokebox typical of the 1950s. P38.002 bore no such adornments and had a more conventional appearance. Both engines had tenders with part bogie and part fixed frame similar to the American 'centipede' tenders.^[3]^{[page needed]}

Barris, W. "The Yellowstone Type Locomotive". SteamLocomotive.com. Archived from the original on 2003-02-03. Retrieved January 4, 2003.
Brown, John K. (1995). The Baldwin Locomotive Works - A Study in American Industrial Practice. Johns Hopkins University Press.
Dixon, Thomas W. Jr.; Withers, Bob (2007). Baltimore and Ohio's Magnificent 2-8-8-4 EM-1 Articulated Locomotive. Forest, VA: TLC Publishing. ISBN 978-0-939487-83-7.
LeMassena, R. (2000). "David Moffat's Double Dilemma". The Railway & Locomotive Historical Society Newsletter. 20 (2). Sacramento: Railway & Locomotive Historical Society.
Rakov, V.A. (1995). Locomotives of the Russian and Soviet Railways - Vol 1 - 1845 to 1955. Moscow: M. Transjeldorizdat.
Roberts, Charles S. (2001). West End, Cumberland to Grafton 1848–1991 (Second ed.). Baltimore, MD: Barnard, Roberts & Co. Inc. ISBN 0-934118-18-3.
Sagle, Larry; Stauffer, Alvin (1984). B&O Power, Steam, Diesel and Electric Power on the Baltimore and Ohio Railroad (Eighth printing ed.). LCCN 64023526.
Westcott, L., ed. (1960). Model Railroader Cyclopedia Volume 1: Steam Locomotives. Waukesha, WI: Kalmbach. ISBN 0-89024-001-9.