New South Wales Z11 class locomotive

Class of Australian 4-4-2T locomotives

New South Wales Z11 Class

M.40 (Z11) Class Tank Locomotive

Type and origin
Power type	Steam
Builder	Beyer, Peacock & Company
Serial number	3324–3338
Build date	1891
Total produced	15

Specifications
Configuration:
• Whyte	4-4-2T
Gauge	4 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)
Wheelbase	28 ft 1 in (8.56 m)
Length	38 ft 1+1⁄2 in (11.62 m)
Axle load	14 long tons 8 cwt (32,300 lb or 14.6 t)
Adhesive weight	28 long tons 14 cwt (64,300 lb or 29.2 t)
Loco weight	56 long tons 9 cwt 1 qr (126,480 lb or 57.37 t)
Fuel type	Coal
Fuel capacity	2+1⁄4 long tons (2.5 short tons; 2.3 t)
Water cap.	1,200 imp gal (5,500 L; 1,400 US gal)
Boiler	4 ft 5 in (1,346 mm)
Boiler pressure	160 psi (1,103 kPa)
Heating surface:
• Firebox	18.75 sq ft (1.742 m)
• Tubes	(219) 1+7⁄8 sq ft (0.17 m)
• Tubes and flues	1,221.0 sq ft (113.43 m)
• Total surface	113.0 sq ft (10.50 m)
Cylinders	2 inside
Cylinder size	17 in × 26 in (432 mm × 660 mm)
Valve gear	Stephenson

Performance figures
Tractive effort	15,800 lbf (70 kN)

Career
Operators	New South Wales Government Railways
Number in class	15
Numbers	As built: 40-54 Post 1924: 1101-1113
Disposition	All scrapped

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.

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.

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 They were superseded by the Class 30 and transferred for use on Newcastle suburban services.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. 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. None were preserved.

References

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