WAGR M class

WAGR M/Ms class
Type and origin
Power typeSteam
DesignerBeyer, Peacock & Co
BuilderBeyer, Peacock & Co
Serial number5477-5482, 5665-5671
Build date1911, 1913
Total produced13
Specifications
Configuration:
 • Whyte2-6-0+0-6-2 (Garratt)
 • UIC
  • M: (1′C)(C1′) n4t
  • Ms: (1′C)(C1′) h4t
Gauge3 ft 6 in (1,067 mm)
Loco weightM: 68 long tons 16 cwt (154,100 lb or 69.9 t)
Ms: 69 long tons 16 cwt (156,400 lb or 70.9 t)
Fuel typeCoal
Fuel capacity4 long tons (4.1 t)
Water cap.2,000 imp gal (9,100 L; 2,400 US gal)
Firebox:
 • Grate area22.6 sq ft (2.10 m2)
Boiler pressure
  • M: 175 psi (1.21 MPa)
  • Ms: 160 psi (1.10 MPa)
Heating surface:
 • Firebox107 sq ft (9.9 m2)
 • Tubes
  • M: 1,233 sq ft (114.5 m2)
  • Ms: 960 sq ft (89 m2)
 • Total surface
  • M: 1,340 sq ft (124 m2)
  • Ms: 1,067 sq ft (99.1 m2)
Superheater:
 • Type
 • Heating area
  • M: N/A
  • Ms: 199 sq ft (18.5 m2)
Cylinders4 (Garratt)
Cylinder size
  • M: 12.5 in × 20 in (318 mm × 508 mm)
  • Ms: 13.25 in × 20 in (337 mm × 508 mm)
Performance figures
Tractive effort
  • M: 22,436 lbf (99.80 kN)
  • Ms: 24,488 lbf (108.93 kN)
Factor of adh.
  • M: 5.3
  • Ms: 5
Career
OperatorsWestern Australian Government Railways
Numbers
  • M388–M393
  • Ms424–Ms430
Dispositionall scrapped

The WAGR M class was a class of 2-6-0+0-6-2 Garratt-type articulated steam locomotives operated by the Western Australian Government Railways (WAGR) between 1912 and 1955. A total of 13 were built by Beyer, Peacock & Co, Manchester in two batches.[1]

  1. ^ Gunzburg 1984, p. 92.