PROFILPELAJAR.COM

Specifications
Specifications
Configuration:;
• Whyte	4-8-2
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Driver dia.	72 in (1.829 m)
Axle load	67,750 lb (30,700 kg; 30.7 t)
Adhesive weight	271,000 lb (122.9 t)
Loco weight	385,000 lb (174.6 t)
Tender weight	378,360 lb (172,000 kg; 172 t)
Total weight	768,360 lb (349,000 kg; 349 t)
Tender type	210F75A "Long-haul"
Fuel type	Coal
Fuel capacity	31 t (30.5 long tons; 34.2 short tons)
Water cap.	22,020 Gallons
Firebox:
• Grate area	69.90 sq ft (6.494 m2)
Boiler pressure	270 psi (1.86 MPa)
Feedwater heater	Worthington
Heating surface:
• Firebox	397 sq. ft
Cylinders	Two
Cylinder size	27 in × 30 in (686 mm × 762 mm)
Valve gear	Walschearts
Valve type	Piston

Type and origin
Type and origin
Power type	Steam
Builder	Altoona Works
Serial number	4255
Build date	June 1930

Pennsylvania Railroad 6755
Pennsylvania Railroad 6755
	6755 on display at the Railroad Museum of Pennsylvania in 2010
Power type
Type and origin
Power type	Steam
Builder	Altoona Works
Serial number	4255
Build date	June 1930
Configuration:;
Specifications
Configuration:;
• Whyte	4-8-2
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Driver dia.	72 in (1.829 m)
Axle load	67,750 lb (30,700 kg; 30.7 t)
Adhesive weight	271,000 lb (122.9 t)
Loco weight	385,000 lb (174.6 t)
Tender weight	378,360 lb (172,000 kg; 172 t)
Total weight	768,360 lb (349,000 kg; 349 t)
Tender type	210F75A "Long-haul"
Fuel type	Coal
Fuel capacity	31 t (30.5 long tons; 34.2 short tons)
Water cap.	22,020 Gallons
Firebox:
• Grate area	69.90 sq ft (6.494 m2)
Boiler pressure	270 psi (1.86 MPa)
Feedwater heater	Worthington
Heating surface:
• Firebox	397 sq. ft
Cylinders	Two
Cylinder size	27 in × 30 in (686 mm × 762 mm)
Valve gear	Walschearts
Valve type	Piston
Maximum speed
Performance figures
Maximum speed	70 mph (110 km/h)
Tractive effort	69,711 lbf (310.1 kN)
Factor of adh.	3.89
Operators
Career
Operators	Pennsylvania Railroad
Class	M1b
Numbers	PRR 6755
Retired	1957
Current owner	Pennsylvania Historical and Museum Commission
Disposition	On static display


Locomotive No. 6755
U.S. National Register of Historic Places

Show map of Pennsylvania Show map of the United States
Nearest city	Strasburg, Pennsylvania
Coordinates	39°58′56″N 76°9′40″W / 39.98222°N 76.16111°W / 39.98222; -76.16111
Area	less than one acre
Built	1930
Architect	Pennsylvania Railroad
Architectural style	dual service
MPS	Pennsylvania Railroad Rolling Stock TR
NRHP reference No.	01000519^[1]
Added to NRHP	December 17, 1979

Pennsylvania Railroad 6755 is a preserved M1b class 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.

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 1957, when it was retired from the roster.

Present status

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 havoc 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 2024. ^{[needs update]}