New South Wales Z11 class locomotive

The New South Wales Z11 class (formerly the M40 class) was a class of steam locomotives built by Beyer, Peacock & Company for the New South Wales Government Railways in Australia.[1]

New South Wales Z11 Class
Type and origin
Power typeSteam
BuilderBeyer, Peacock & Company
Serial number3324–3338
Build date1891
Total produced15
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 cap.1,200 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
Number in class15
NumbersAs built: 40-54
Post 1924: 1101-1113
DispositionAll scrapped

They entered suburban traffic in Sydney in 1891. They were primarily intended for use on the steeply-graded Main Northern line from Strathfield to Hornsby and North Shore line from Milsons Point to Hornsby, hence their hefty weight. They were never noted for spectacular performance.[2]

Between 1906 and 1910, they were rebuilt with Belpaire boilers. They were superseded by the Class 30 and transferred for use on Newcastle suburban services. As part of the 1924 reclassification scheme, the remaining 13 members of the class were reclassified as the Z11 class, numbered 1101 to 1113, 50 having been sold to Australian Iron & Steel and 51 to the South Maitland Railway.[2] Post renumbering, 1104 was to the Nepean Sand & Gravel Company, Richmond and 1111 to Southern Portland Cement, Berrima. The remainder were sold for scrap between 1925 and 1927.[2][3] None were preserved.[2]

References
  1. Steam Locomotive Data. Public Transport Commission. 1974. pp. 8, 56.
  2. Grunbach, Alex (1989). A Compendium of New South Wales Steam Locomotives. Sydney: Australian Railway Historical Society. pp. 106, 107. ISBN 0-909650-27-6.
  3. Loco Classes of the New South Wales Government Railways Truck & Bus Transportation May 1940 page 24

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