WAGR M class

WAGR M/Ms class

M388 at East Perth Locomotive Depot, 1926

Type and origin Power type Steam Designer Beyer, Peacock & Co Builder Beyer, Peacock & Co Serial number 5477-5482, 5665-5671 Build date 1911, 1913 Total produced 13

Specifications Configuration: ​  • Whyte 2-6-0+0-6-2 (Garratt)  • UIC M: (1′C)(C1′) n4t Ms: (1′C)(C1′) h4t Gauge 3 ft 6 in (1,067 mm) Loco weight M: 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 type Coal Fuel capacity 4 long tons (4.1 t) Water cap 2,000 imp gal (9,100 l; 2,400 US gal) Firebox:  • Firegrate area 22.6 sq ft (2.10 m2) Boiler pressure M: 175 psi (1.21 MPa) Ms: 160 psi (1.10 MPa) Heating surface M: 1,340 sq ft (124 m2) Ms: 1,067 sq ft (99.1 m2)  • Tubes M: 1,233 sq ft (114.5 m2) Ms: 960 sq ft (89 m2)  • Firebox 107 sq ft (9.9 m2) Superheater: ​  • Type M: N/A Ms: Schmidt  • Heating area M: N/A Ms: 199 sq ft (18.5 m2) Cylinders 4 (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 Operators Western Australian Government Railways Numbers M388–M393 Ms424–Ms430 Disposition all scrapped

Type and origin
Power type	Steam
Designer	Beyer, Peacock & Co
Builder	Beyer, Peacock & Co
Serial number	5477-5482, 5665-5671
Build date	1911, 1913
Total produced	13

Specifications
Configuration:	​
• Whyte	2-6-0+0-6-2 (Garratt)
• UIC	M: (1′C)(C1′) n4t Ms: (1′C)(C1′) h4t
Gauge	3 ft 6 in (1,067 mm)
Loco weight	M: 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 type	Coal
Fuel capacity	4 long tons (4.1 t)
Water cap	2,000 imp gal (9,100 l; 2,400 US gal)
Firebox:  • Firegrate area	22.6 sq ft (2.10 m2)
Boiler pressure	M: 175 psi (1.21 MPa) Ms: 160 psi (1.10 MPa)
Heating surface	M: 1,340 sq ft (124 m2) Ms: 1,067 sq ft (99.1 m2)
• Tubes	M: 1,233 sq ft (114.5 m2) Ms: 960 sq ft (89 m2)
• Firebox	107 sq ft (9.9 m2)
Superheater:	​
• Type	M: N/A Ms: Schmidt
• Heating area	M: N/A Ms: 199 sq ft (18.5 m2)
Cylinders	4 (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
Operators	Western Australian Government Railways
Numbers	M388–M393 Ms424–Ms430
Disposition	all 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 of them were built by Beyer, Peacock & Co, Manchester in two batches.

The first batch of six engines, was built in 1911. This batch, which entered WAGR service in 1912, was only the third Garratt design to be built, and represented a significant step in the development of the type. The second batch, of seven engines, was built in 1913/14, and was designated as the Ms class because its members were superheated. One of the engines in the first batch was later fitted with a superheater and reclassified as an Ms class engine.

All of the M/Ms class locomotives were used to haul trains on the WAGR's light lines. They were withdrawn from service between 1947 and 1955, and all were scrapped.

The numbers and periods in service of each member of the M class were as follows:

The numbers and periods in service of each member of the Ms class were:

The M class designation was previously used for the M class locomotives that were withdrawn in 1911. It was reused in the 1970s when the M class diesel locomotives entered service.

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