Pennsylvania Railroad 6755

Pennsylvania Railroad 6755 is a 4-8-2 "Mountain" type steam locomotive built in 1930 for the Pennsylvania Railroad by the railroad's own Altoona Works as a member of the M1b locomotive class for mainline freight service. Retired from commercial service in 1957, the locomotive was preserved by the Pennsylvania Railroad and was placed on display at the Railroad Museum of Pennsylvania in Strasburg, Pennsylvania. The 6755 is the only M1 class locomotive to have survived into preservation.

Pennsylvania Railroad 6755
6755 on display at the Railroad Museum of Pennsylvania
Type and origin
Power typeSteam
BuilderAltoona Works
Serial number4255
Build dateJune 1930
Specifications
Configuration:
​
 • Whyte4-8-2
Gauge4 ft 8 1⁄2 in (1,435 mm)
Driver dia.72 in (1.829 m)
Axle load67,750 lb (30,700 kg; 30.7 t)
Adhesive weight271,000 lb (122.9 t)
Loco weight385,000 lb (174.6 t)
Tender weight378,360 lb (172,000 kg; 172 t)
Total weight768,360 lb (349,000 kg; 349 t)
Tender type210F75A "Long-haul"
Fuel typeCoal
Fuel capacity31 t (30.5 long tons; 34.2 short tons)
Water cap22,020 Gallons
Firebox:
 • Firegrate area		69.90 sq ft (6.494 m2)
Boiler pressure270 psi (1.86 MPa)
Feedwater heaterWorthington
Heating surface:
 • Firebox		397 sq. ft
CylindersTwo
Cylinder size27 in × 30 in (686 mm × 762 mm)
Valve gearWalschearts
Valve typePiston
Performance figures
Maximum speed70 mph (110 km/h)
Tractive effort69,711 lbf (310.1 kN)
Factor of adh.3.89
Career
OperatorsPennsylvania Railroad
ClassM1a
Retired1957
Current ownerPennsylvania Historical and Museum Commission
DispositionStatic display
Locomotive No. 6755
Nearest cityStrasburg, Pennsylvania
Coordinates39°58′56″N 76°9′40″W
Arealess than one acre
Built1930
ArchitectPennsylvania Railroad
Architectural styledual service
MPSPennsylvania Railroad Rolling Stock TR
NRHP reference No.01000519[1]
Added to NRHPDecember 17, 1979

History

The 6755 was built by the Altoona Works in 1930. The 6755 was a class M1a and was used predominantly in freight service, though it would occasionally be used for passenger trains. In 1953, the locomotive went back to the Altoona Works and was rebuilt into a class M1b. The locomotive continued to be used for freight service until January 1957 when it was retired from the roster.

Present status

Today, the 6755 is on static display at the Railroad Museum of Pennsylvania in Strasburg, Pennsylvania.[2] The 6755 has since been deteriorating at a rapid pace, with its boiler jackets removed in the early 2000s. Prolonged exposure to the elements has wreaked havock on major parts of the locomotive, causing structural rust. The 6755 is one of the locomotives the museum plans to place inside the roundhouse currently under construction as of March 2014.

See also

NYC 3001- This is the New York Central Railroad's version of the M1 that survives. Just like the 6755, the 3001 was a dual service locomotive.

References
  1. "National Register Information System". National Register of Historic Places. National Park Service. March 13, 2009.
  2. "Railroad Museum of Pennsylvania". Railroad Museum of Pennsylvania. October 19, 2009. Archived from the original on January 27, 2016. Retrieved May 2, 2010.


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