John Miller Dudley
John Miller Dudley was born on 22 June 1923 in Mount Gambier, South Australia. He began his career as an apprentice fitter with South Australian Railways (SAR) at the Islington Workshops in Adelaide in 1942. A year later, after winning a scholarship to the South Australian School of Mines and Industries, he began his studies in Mechanical Engineering.
On completing his studies in 1946, John returned to Islington’s Mechanical Branch as a qualified engineer. Here he worked on the 350 class (350 hp Bo-Bo) shunters and then on the streamlined 900 class (1,760 hp A1A-A1A) locomotives. The 350 class was the first Australian designed and built diesel-electric locomotive and the 900 class was the first Australian designed and built diesel-electric locomotive to enter mainline service. Both classes being powered by English Electric traction equipment. Between 1951 and 1954 John acted as Locomotive Superintendent in the Adelaide, Murray Bridge and Peterborough regions.
In 1954, he was invited by the Managing Director of English Electric’s Australian operations, Mr C. W. Goodman, to relocate to Brisbane to assist with establishing a local locomotive design office in the company’s works in the southern suburb of Rocklea.
The Rocklea office was a small but specialised group, typically comprising around five engineers supported by tracers and drafting staff. John worked as one of this core engineering group and was frequently consulted on design matters.
Over the following decade, John was involved in the original design and development of multiple diesel-electric locomotives for use across Australia in both industrial and mainline applications. His work focused on practical engineering solutions within strict constraints, particularly weight limits, track standards, and operational demands unique to Australian railways. Locomotives associated with his design work at English Electric include:
· The 400 hp and 850 hp industrial diesel-electric locomotives Australian Iron & Steel in Port Kembla.
· The Midland Railway of Western Australia F class (750 hp, A1A-A1A), designed to operate within tight axle load restrictions and G class (1030 hp, Co-Co), incorporating high-adhesion bogies suited to freight duties
· The Queensland Railways 1250 class (1500 hp, Co-Co), designed within a 90-ton limit and adapted to Queensland’s requirements, including a narrow carbody configuration preferred by the railway
· The Western Australian Government Railways C class (1500 hp, Co-Co), developed to similar principles with local modifications
· The Tasmanian Y class, for which John undertook substantial design work in the early part of the project.
He co-authored a technical paper titled “Diesel Electric Locomotives – Design, Operation and Overseas Developments” with JF Jeffcoat and PJ Goldston which was presented to the Brisbane Division of The Institution of Engineers, Australia in June 1962.
With such a vast knowledge of locomotives it was hardly surprising that in 1962 John was enticed back to South Australia to become the Commonwealth Railway’s assistant mechanical engineer in Port Augusta. He held that position until 1974 when he was appointed Chief Mechanical Engineer at Port Augusta.
In 1979 he was appointed Chief Mechanical Engineer of Australian National Railways, which had acquired the assets of Commonwealth Railways in 1975. He retired in 1983 after four decades in the rail industry.
John Miller Dudley was one of the pioneers of diesel-electric traction in Australia.
In 2026 John Dudley was still living in South Australia.
Biography researched and written by David Jehan
