2-8-8-4
DM&IR Yellowstones
 |
|
|
| Specifications |
| Configuration |
2-8-8-4 |
| UIC class |
(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) |
| 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 tonnes (29 short tons; 26 long tons) |
| Water cap |
25,000 US gal (95 m3) |
Firebox:
• Firegrate area |
125 sq ft (11.6 m2) |
| Boiler pressure |
240 psi (1.7 MPa) |
| Cylinders |
Four |
| Cylinder size |
26 by 32 in (660 by 813 mm) |
|
|
|
|
|
| Specifications |
| Configuration |
2-8-8-4 |
| UIC class |
(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) |
| 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 tonnes (29 short tons; 26 long tons) |
| Water cap |
25,000 US gal (95 m3) |
Firebox:
• Firegrate area |
125 sq ft (11.6 m2) |
| Boiler pressure |
240 psi (1.7 MPa) |
| Cylinders |
Four |
| Cylinder size |
26 by 32 in (660 by 813 mm) |
B&O EM-1 2-8-8-4 Yellowstone
|
|
| Specifications |
| Configuration |
2-8-8-4 |
| UIC class |
(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 tonnes (28 short tons; 25 long tons) |
| Water cap |
22,000 US gal (83 m3) |
Firebox:
• Firegrate area |
117.5 sq ft (10.92 m2) |
| Boiler |
94 1⁄8 in (2.39 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) |
|
|
|
| Career |
| Operators |
Baltimore & Ohio Railroad (B&O) |
| Class |
EM-1 |
| Numbers |
7600–7629 later 650–679
|
| Last run |
April 19, 1960 |
| Preserved |
0 |
| Disposition |
All thirty scrapped by 1960. |
|
| Specifications |
| Configuration |
2-8-8-4 |
| UIC class |
(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 tonnes (28 short tons; 25 long tons) |
| Water cap |
22,000 US gal (83 m3) |
Firebox:
• Firegrate area |
117.5 sq ft (10.92 m2) |
| Boiler |
94 1⁄8 in (2.39 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) |
| Career |
| Operators |
Baltimore & Ohio Railroad (B&O) |
| Class |
EM-1 |
| Numbers |
7600–7629 later 650–679
|
| Last run |
April 19, 1960 |
| Preserved |
0 |
| Disposition |
All thirty scrapped by 1960. |
Under the Whyte notation a 2-8-8-4 is a steam locomotive with two leading wheels, two sets of eight driving wheels, and a four-wheel trailing truck.
Other equivalent classifications are:
The equivalent UIC classification is, refined for Mallet locomotives, (1′D)D2′.
Such a long locomotive must be an articulated locomotive, and all the examples produced were with a joint in the frame between the first and second groups of driving wheels. The superstructure of the locomotive was attached to the rearmost set and the forward set and leading truck could swing laterally on curves.
The type was generally named the Yellowstone, a name given it by the first owner, the Northern Pacific Railway, whose lines run near Yellowstone National Park. Seventy-two Yellowstone type locomotives were built for four different US railroads.
The 2-8-8-4 was a common arrangement for the largest steam locomotives. 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.
The Northern Pacific Railway was the first railroad to order a 2-8-8-4. The first was built in 1928 by ALCO; it was the largest locomotive built until then, and it had the largest firebox ever applied to a steam locomotive, some 182 square feet (16.9 m2) in area. The purpose was to burn Rosebud coal, a cheap low-quality coal. That firebed was too large for the available draft and the fire burned poorly. The problem was mitigated by blocking off the first few feet of the grates. Baldwin built eleven more for the NP in 1930. None were saved.
...
Wikipedia
