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Boston and Maine 3713 information


Boston and Maine No. 3713
B&M No. 3713 on static display at Steamtown, U.S.A.
Type and origin
References:[1]
Power typeSteam
BuilderLima Locomotive Works
Serial number7625
Build dateDecember 1934
Rebuild date1995–ongoing
Specifications
Configuration:
 • Whyte4-6-2
 • UIC2′C1′ n2
Gauge4 ft 8+12 in (1,435 mm)
Driver dia.80 in (2,032.0 mm)
Wheelbase77 ft 7 in (23.6 m)
Adhesive weight209,500 lb (95,027.6 kilograms; 95.0 tonnes)
Loco weight339,200 lb (153,858.5 kg; 153.9 t)
Tender weight240,800 lb (109,225.0 kg; 109.2 t)
Total weight580,000 lb (263,083.6 kg; 263.1 t)
Fuel typeCoal
Fuel capacity37,000 lb (16,782.9 kg; 16.8 t)
Water cap.12,000 US gallons (45,000 L; 10,000 imp gal)
Firebox:
 • Grate area66.9 sq ft (6.22 m2)
Boiler pressure260 psi (1.79 MPa)
Feedwater heaterCoffin
Heating surface:
 • Firebox320 sq ft (30 m2)
 • Tubes and flues3,848 sq ft (357.5 m2)
 • Total surface4,814 sq ft (447.2 m2)
Superheater:
 • Heating area966 sq ft (89.7 m2)
CylindersTwo
Cylinder size23 in × 28 in (584 mm × 711 mm)
Valve gearWalschaerts
Valve typePiston valves
Performance figures
Tractive effort40,918 lbf (182 kN)
52,800 lbf (235 kN) (w/ booster)
Factor of adh.5.12
Career
OperatorsBoston and Maine Railroad (1934–1958)
ClassP-4a
Numbers
  • B&M 3713
Official name"The Constitution"
LocaleNew England
DeliveredDecember 21, 1934
Last runApril 22, 1956
RetiredJuly 1956
PreservedJune 11, 1958
Current ownerSteamtown National Historic Site
DispositionUndergoing restoration to operating condition

Boston and Maine 3713, also known as the "Constitution", is the sole survivor of the "P-4a" class 4-6-2 "Heavy Pacific" type steam locomotives. It was built in December 1934 by the Lima Locomotive Works for the Boston and Maine Railroad, hauling passenger trains around the New England region. In 1956, No. 3713 was given the duty to haul B&M's Farewell to Steam excursion between Boston, Massachusetts and Portland, Maine, marking the end of steam operations on the B&M.

Afterwards, the locomotive was purchased by New England millionaire F. Nelson Blount for his Steamtown, U.S.A. collection. After Blount died in 1967, No. 3713 was loaned to the Boston Museum of Science for static display. In 1985, No. 3713 was returned to Steamtown, which had moved to Scranton, Pennsylvania, one year prior.

When Steamtown was nationalized as Steamtown National Historic Site, work began in 1995 to restore No. 3713 to operating condition for use in pulling excursion trains. It was the focus of Project 3713, a partnership between the National Park Service and the Lackawanna & Wyoming Valley Railway Historical Society. As of 2024, restoration work on the No. 3713 locomotive is still ongoing.

  1. ^ "Boston and Maine Railroad No. 3713". Steamtown. National Park Service. February 14, 2002. Archived from the original on June 12, 2020. Retrieved October 11, 2021.

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