Melbourne and Hobson's Bay Railway Company 2-2-2WT (1854)

[note 1] It had 7+7⁄8 in (200 mm) diameter cylinders and was capable of producing 30.0 horsepower (22.4 kilowatts), reaching 25 mph (40 km/h) and hauling 130 tonnes (130 long tons; 140 short tons).

The company therefore took the bold step of tasking the Melbourne foundry company Robertson, Martin & Smith, which had never produced one, to construct within 10 weeks a 2-2-2 well-tank locomotive to the design of the railway's chief engineer.

[1]: 104 Robertson, Martin & Smith constructed the locomotive at Joseph Raleigh's disused boiling down works on the Saltwater River (now Maribyrnong River) near Footscray, with boiler fabrication being subcontracted to Langlands foundry.

Its operation was interrupted by down-time on three occasions while broken crank-axles were repaired.

During those periods the 0-4-0 locomotive that had hauled ballast wagons during the railway's construction was utilised.

The locomotive was hurriedly built by Robertson, Martin & Smith in time for the inauguration of the Melbourne and Hobson's Bay railway when production of Robert Stephenson and Company 's locomotives in the UK was delayed