New South Wales D59 class locomotive

New South Wales D59 class
Oil burning 5903 heading south at Hawkesbury River station
Type and origin Power type Steam Builder Baldwin Locomotive Works Philadelphia Serial number 75564–75583 Build date August 1952-March 1953 Total produced 20
Specifications Configuration: ​  • Whyte 2-8-2  • UIC 1'D1'h Gauge 4 ft 8 1⁄2 in (1,435 mm) Driver dia. 5 ft 0 in (1.524 m) Adhesive weight 65 t (64.0 long tons; 71.7 short tons) Loco weight 91 t (89.6 long tons; 100.3 short tons) Fuel type Oil, later coal Fuel capacity 10,800 litres (2,400 imp gal; 2,900 US gal) (oil) 11 t (10.8 long tons; 12.1 short tons) (coal) Water cap 24,750 litres (5,440 imp gal; 6,540 US gal) Firebox:  • Firegrate area 47 sq ft (4.4 m2) Boiler pressure 1,378 kPa (199.9 psi) Heating surface 2,165 sq ft (201.1 m2) Superheater: ​  • Heating area 625 sq ft (58.1 m2) Cylinders Two, outside Cylinder size 21 in × 28 in (533.4 mm × 711.2 mm) Valve gear Walscharts
Performance figures Tractive effort 34,986 lbf (155.6 kN) Factor of adh. 4.09
Career Operators New South Wales Government Railways Class D59 Numbers 5901–5920 Disposition 5 preserved, 15 scrapped

The 59 Class was a class of steam locomotive built by Baldwin Locomotive Works for the New South Wales Government Railways of Australia.

The class were ordered from the Baldwin Locomotive Works to relieve motive power shortages. The design is a variation on the USATC S200 Class Mikado, a design which first appeared in 1941.

Twenty locomotives entered service between August 1952 and March 1953. The most immediately apparent difference is the rather stubby short tender that was specially built to allow the 59 class to be turned on standard 60-foot (18.29 m) turntables. It was the specification of these tenders which considerably delayed the delivery from initial order. Unfortunately due to the weight of the locomotive it was eventually discovered in service that most 60-foot (18.29 m) turntables could not turn the 59 class due to balancing issues.

The class was the first 'new build' (as opposed to conversions) oil-fired engines to be introduced by the New South Wales Government Railways and were the first locomotives to be built for NSW by Baldwin since 1905. They were initially used on the Short North from Enfield to Broadmeadow. They were soon placed in service on both the Main Western and Main South lines and, although their light axle load made them available to a large proportion of the state, their sphere of operation was limited by the location of oil fueling facilities. Accordingly, they saw most of their service as oil burners working on the Main North and North Coast lines, as well as in the Sydney metropolitan area.