Great Northern M-1

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Great Northern Railway class M-1
Great Northern steam locomotive 1951, Skykomish, ca. 1924.jpg
GN 1951 at Skykomish, circa 1924
Type and origin
Power typeSteam
BuilderBaldwin Locomotive Works
Serial number34024–34028, 34074–34076, 34104, 34105, 34824–34833, 34965, 34967, 34968, 34997–34999, 35046–35052, 35088, 35089
ModelBaldwin 16-40/64 DE
Build dateDecember 1909 – August 1910
Total produced35
RebuilderGN shops
Rebuild date1926-1927 (Rebuilt To : M-2) 1930 (Rebuilt To 21 O-7 Mikado’s) 1932 (3 Rebuilt To : O-8 Mikado’s)
Number rebuilt35 (21 Rebuilt To O-7 Mikado’s) (3 Rebuilt to O-8 Mikado’s)
Specifications
Configuration:
 • Whyte2-6-8-0
 • UIC(1′C)D n4v
Gauge4 ft 8+12 in (1,435 mm)
Driver dia.55 in (1.397 m)
Adhesive weight350,000 lb (160,000 kg)
Loco weight368,700 lb (167,200 kg)
Boiler pressure210 lbf/in2 (1.45 MPa)
CylindersFour, Mallet compound
High-pressure cylinder23 in × 32 in (584 mm × 813 mm)
Low-pressure cylinder35 in × 32 in (889 mm × 813 mm)
Performance figures
Maximum speed35-63 Mph
Tractive effort78,360 lbf (348.56 kN)
Career
OperatorsGreat Northern Railway
ClassM-1
Numbers1950–1984
Retired1929–1954
DispositionAll scrapped after rebuilding to class M-2, O-7 & O-8

The Great Northern Railway M-1 was a class of 35 American 2-6-8-0 locomotives introduced in 1910. A total of 35 of these Mallet locomotives were built by Baldwin Locomotive Works in two batches; the first 10 in December 1909, followed by a further 25 in June to August 1910.[1] They were early articulateds and worked their entire life on the Great Northern Railway (GN). These engines were unusual because of having two uneven sets of driving wheels; the front set having six driving wheels, and the rear set having eight driving wheels.

All M-1's were converted to be simple-expansion cylinders from 1926 to 1927 and reclassified M-2. Twenty-two of the M-2's were dismantled between 1929 and 1931, with parts being recycled into new class O-7 Mikados numbered 3376-3396 in 1930 . Three O7 Mikado’s were rebuilt to O8 Mikados numbered 3397-3399 in 1932 . The 13 M-2's not rebuilt lasted until the dieselisation era, and were sold for scrap between 1949 and 1954. No M-1's have survived into preservation. None of the O-8's that were rebuilt from the O-7's that were once part of the M-1's were preserved either.[2]

Images[]

  • [1] as M-1.
  • [2] as rebuilt to M-2.

References[]

  1. ^ Keyes & Middleton 1980, pp. 94, 96.
  2. ^ Keyes & Middleton 1980, pp. 94, 96, 106, 108.
  • Keyes, Norman C., Jr.; Middleton, Kenneth R. (Autumn 1980). "The Great Northern Railway Company: All-Time Locomotive Roster 1861-1970". Railroad History. Boston, Massachusetts: The Railway and Locomotive Historical Society, Inc. (143). ISSN 0090-7847.
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