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 type Steam Builder Beyer, Peacock and Company Serial number 3324–3338 Build date 1891 Total produced 15 Rebuilder NSWGR
Specifications Configuration: ​  • Whyte 4-4-2T Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Leading dia. 3ft 25in Driver dia. 5ft 8in Trailing dia. 4ft 0in Wheelbase 28ft 11in Length 38ft 1 1⁄2in Axle load 14t 8cwt Adhesive weight 28t 14cwt Loco weight 56t 9cwt 1q Fuel type Coal Fuel capacity 2 1/4 tons Water cap 1200 gallons Boiler 4ft 5in Boiler pressure 160psi Heating surface 113.0 sq.ft.  • Tubes (219) 1ft 7/8in  • Tubes and flues 1221.0 sq.ft.  • Firebox 18.75 sq.ft. Cylinders 2 inside Cylinder size 17in x 26in Valve gear Stephenson
Performance figures Tractive effort 15,800psi
Career Operators New South Wales Government Railways Class M40 - Z11 Number in class 15 Numbers 1101-1115

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 They were soon superseded by the S636 class 4-6-4Ts and were promptly used on Newcastle suburban services for a period.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.