PRR H6
Pennsylvania Railroad H6/H6a/H6b/H6sa/H6sb
PRR 2846 |
Type and origin |
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Power type |
Steam |
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Builder |
PRR Altoona Works, Baldwin Locomotive Works, Alco -P |
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Build date |
H6: 1899-1901 H6a: 1901-1905 H6b: 1905–1913 |
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Total produced |
H6: 189 H6a: 1,242 H6b: 603 Total: 2,034 |
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Number rebuilt |
699 to H6sa/H6sb |
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Specifications |
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Configuration |
2-8-0 |
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Gauge |
4 ft 8 1⁄2 in (1,435 mm) |
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Leading dia. |
36 in (0.91 m) |
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Driver dia. |
56 in (1.42 m) |
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Length |
65 ft 11 in (20.09 m) (including 70F70 tender)[1] |
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Adhesive weight |
180,000 lb (81,650 kg))[1] |
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Loco weight |
204,800 lb (92,900 kg))[1] |
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Total weight |
343,600 lb (155,900 kg) |
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Fuel type |
Coal |
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Fuel capacity |
29,200 lb (13,200 kg))[1] |
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Water cap |
7,200 US gal (27,000 l; 6,000 imp gal))[1] |
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Firebox: • Firegrate area |
H6: 33.3 sq ft (3.09 m2) Others: 49.0 sq ft (4.55 m2) |
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Boiler pressure |
195 psi (1.34 MPa) |
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Cylinders |
Two |
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Cylinder size |
H6/H6a/H6b: 22 in × 28 in (560 mm × 710 mm) H6sa/H6sb: 23 in × 28 in (580 mm × 710 mm) |
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Performance figures |
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Tractive effort |
H6: 42,717 lbf (190.01 kN) H6a/H6b: 42,168 lbf (187.57 kN) H6sa/H6sb43,841 lbf (195.01 kN) |
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The Pennsylvania Railroad's class H6, H6a, and H6b steam locomotives were of the 2-8-0 "Consolidation" freight type, the most numerous class on the railroad with 2032 units. The three sub-classes differed as follows:[4]
Class |
Firebox |
Gate |
Tractive Force |
Driver Size |
#Built |
Years Built |
H6 |
narrow |
33.3 |
42717 |
56” |
189 |
1899-01 |
H6a |
Wide |
49 |
42168 |
56" |
1242 |
1901-05 |
H6b |
Wide |
49 |
42168 |
56" |
603 |
1905-13 |
In the 1920s, 699 H6a and H6b had superheaters added and cylinder size increased from 22” to 23” and reclassified to H6sa and H6sb.
Class H6 were used throughout the system as mainline freight haulers, on local freights, and as switchers in yards. They were frequently seen double and triple heading long freight trains up the steep grades on the Pennsy.[5]
During the period when the PRR was building the H-6 class, the railroad had effective stock control of the B&O, and installed a cooperative president Leonor Loree. The B&O acquired from American Locomotive Co. a large group of identical locomotives, originally classed I-4, but later classified as B&O class E-24. The E-24 class had many variations, some being converted to switchers, superheated, and new valve chests. The E-24a was equivalent to the PRR H-6sb. On the B&O the E-24 class survived to the Diesel era.
Survivors
PRR #2846, an H6sb built in 1905 by the Baldwin Locomotive Works, has been preserved by the Railroad Museum of Pennsylvania with two other examples of the H class. #2846 was added to the National Register of Historic Places in 1979 as Consolidation Freight Locomotive No. 2846.
References
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