New South Wales Z11 class locomotive

The Z11 class (formerly the M40 class) was a class of steam locomotives built for the New South Wales Government Railways in Australia.[1][2][3][4]

New South Wales Z11 Class
M.40 (Z11) Class Tank Locomotive
Type and origin
Power typeSteam
BuilderBeyer, Peacock and Company
Serial number3324–3338
Build date1891
Total produced15
RebuilderNSWGR
Specifications
Configuration:
​
 • Whyte4-4-2T
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Leading dia.3 ft 25 in (1,549 mm)
Driver dia.5 ft 8 in (1,727 mm)
Trailing dia.4 ft 0 in (1,219 mm)
Wheelbase28 ft 1 in (8.56 m)
Length38 ft 1 1⁄2 in (11.62 m)
Axle load14 long tons 8 cwt (32,300 lb or 14.6 t)
Adhesive weight28 long tons 14 cwt (64,300 lb or 29.2 t)
Loco weight56 long tons 9 cwt 1 qr (126,480 lb or 57.37 t)
Fuel typeCoal
Fuel capacity2 1⁄4 long tons
(2.5 short tons; 2.3 t)
Water cap1,200 imp gal
(5,500 l; 1,400 US gal)
Boiler4 ft 5 in (1,346 mm)
Boiler pressure160 psi (1,103 kPa)
Heating surface113.0 sq ft (10.50 m2)
 • Tubes(219) 1 7⁄8 sq ft (0.17 m2)
 • Tubes and flues1,221.0 sq ft (113.43 m2)
 • Firebox18.75 sq ft (1.742 m2)
Cylinders2 inside
Cylinder size17 in × 26 in
(432 mm × 660 mm)
Valve gearStephenson
Performance figures
Tractive effort15,800 lbf (70 kN)
Career
OperatorsNew South Wales Government Railways
ClassM40 - Z11
Number in class15
Numbers1101-1115

Built by Beyer, Peacock and Company of Manchester, they entered suburban traffic in Sydney in 1891.

They were primarily intended for use on the steeply-graded Strathfield-Hornsby and Milson's Point-Hornsby sections, hence their hefty weight which served to hinder them later in their careers. Because of this, they were never noted for spectacular performance.

Between 1906 and 1910, they were rebuilt with Belpaire boilers. They were soon superseded by the S636 class 4-6-4Ts and were promptly used on Newcastle suburban services for a period. In 1924, all were renumbered as part of the Z11 Class.

No. 50 was sold to Australian Iron & Steel Ltd., No. 51 to the South Maitland Railway, No. 1104 to the Nepean Sand & Gravel Company and No. 1111 to the Southern Portland Cement Company of Berrima. The remainder were sold for scrap between 1925 and 1927.

None are preserved.


  • No.51 locomotive

See also

References
  1. Preston, Ron G (1984). Tender into Tank. Sydney: New South Wales Rail Transport Museum. pp. 11–57. ISBN 0 909862 18 4.
  2. Grunbach, Alex (1989). A Compendium of New South Wales Steam Locomotives. Sydney: Australian Railway Historical Society, NSW Division. pp. 41–45. ISBN 0 909650 27 6.
  3. New South Wales Railways 1855-1955. Published by Department of Railways
  4. Steam Locomotive Data. Public Transport Commission Of N.S.W. 1974. pp. 8, 56.


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