<kuid2:73150:100413:2> NSW SRA Tri-Bo 86 TS12

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The locomotives were built at Bowesfield Works, Stockton-on-Tees, England, with electrical equipment supplied by Metropolitan-Vickers from its Trafford Park and Sheffield plants. Metropolitan-Vickers drew on experience gained from its earlier class EM1 and EM2 electric locomotives, which were used on the Woodhead Line in the UK and in The Netherlands.

These electric locomotives were originally purchased as part of the Blue Mountains electrification works, and spent their life hauling coal, freight and passenger carriages under the wires. The 46 class locomotives were often seen double or triple heading coal and freight services.

The class 46 was the most powerful locomotive in Australia for many years, with a one hour rating of 3,780 horsepower (2,820 kW) and ability to deliver more than that for short periods. They proved to be very reliable and were generally considered superior to the much newer and even more powerful Comeng-Mitsubishi 85 class and 86 class electric locomotives. Their build quality and durability was such that 38 of the original 40 remained on the books in 1990.
Serial number 786–825
Build date 1956
Total produced 40
Co+Co
Gauge 4 ft 8 1?2 in (1,435 mm)
Wheel diameter 45 in (1,143 mm)
Wheelbase 41 ft 0 in (12.50 m)
Length Over headstocks: 51 ft 2 in (15.60 m), Over coupler pulling faces: 53 ft 11 1?4 in (16.44 m)
Width 9 ft 7 in (2.92 m)
Height Over stowed pantograph: 14 ft 6 in (4.42 m)
Axle load 18 tons 14 cwt (41,900 lb or 19.0 t)
Locomotive weight 112 tons 0 cwt (250,900 lb or 113.8 t)
Electric system 1,500 V DC
Traction motors MV 272 (6 off)
Top speed 70 mph (113 km/h)
Power output Continuous: 3,400 hp (2,540 kW), One hour: 3,780 hp (2,820 kW)
Tractive effort Continuous: 36,700 lbf (163.25 kN), One hour: 40,800 lbf (181.49 kN) at 34.5 mph (55.5 km/h)