Transwa ADR/ADS class
Class of Australian diesel multiple unit trains
From Wikipedia, the free encyclopedia
The Transwa ADR/ADS class is a class of 3-car diesel multiple units built by Alstom in Bellevue, Western Australia for the Public Transport Authority to operate the Australind service between Perth and Bunbury.
| Transwa ADR/ADS class | |
|---|---|
Australind set 04 at Harvey station | |
| Stock type | Diesel-hydraulic multiple unit |
| In service | 2026–present |
| Manufacturer | Alstom |
| Built at | Sri City, India and Bellevue, Western Australia |
| Replaced | ADP/ADQ class |
| Constructed | 2022–2025 |
| Entered service | 29 June 2026 |
| Number built | 12 carriages (4 sets) |
| Formation | ADR–ADS–ADR |
| Fleet numbers |
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| Capacity |
|
| Operator | Transwa |
| Depots | Claisebrook Railcar Depot, Bellevue Railway Depot, Picton Yard |
| Line served | South Western Railway |
| Specifications | |
| Car body construction | Stainless steel |
| Train length | 72.49 m (237 ft 10 in) |
| Car length |
|
| Width | 2.86 m (9 ft 5 in) |
| Height | 3,878 mm (12 ft 8.7 in) |
| Floor height | 1,205 mm (3 ft 11.4 in) |
| Doors | 1 per side of car |
| Wheel diameter | 850 mm (33 in) |
| Wheelbase | 2,400 mm (7 ft 10 in) |
| Maximum speed |
|
| Weight |
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| Prime mover | Voith R2876T3-390 (MAN D2876LUE631) horizontal R6 diesel engine |
| Power output | 390 kW (520 hp) |
| Transmission | Hydrodynamic turbo transmission via cardan shaft |
| Gearbox | Voith SK 485 |
| Power supply |
|
| HVAC | 1 per car |
| Bogies | Fabricated |
| Braking systems | Electro pneumatic (friction) and hydrodynamic brakes |
| Safety system | ATP |
| Coupling system | Dellner |
| Track gauge | 1,067 mm (3 ft 6 in) |
Design
Each set features an onboard buffet, improved accessibility over its predecessor, in-seat USB charging, LED lighting and 14 bicycle storage spaces.
Each new train will also feature unique Aboriginal artwork from a local Indigenous artist, giving each train a distinct identity.[1]
History
In December 2019, the Public Transport Authority signed a contract with Alstom to deliver 41 6-car C Series EMUs and two 3-car like-for-like replacements for the life-expired ADP/ADQ Class Australind railcars.[2][3][4] In January 2025, the order was doubled to four 3-car DMUs.[5]
The ADR/ADS railcars share similar features to the C Series EMUs, both cosmetically and electrically. They operate in semi-permanently coupled 3-car sets. Each car is powered by a Voith R2876T3-390 (MAN D2876LUE631) horizontal R6 diesel engine via a cardan shaft to a single axle.[citation needed]
The first railcar left the Alstom Manufacturing and Assembly Facility at Bellevue on 26 September 2025 and testing commenced at Cardup on 30 September 2025. High-speed testing between Mandurah and Rockingham was undertaken from November 2025.[citation needed] Testing on the Arc Infrastructure network commenced on 23 February 2026 with the first run to Bunbury on 4 March 2026.[6]
A new orange livery was unveiled to the public on 27 March 2026.[7] Names for the four railcars: Marley, Kwilena, Koombana and Linda, were revealed on 18 June 2026 following a public competition.[8] The chosen names relate to the Bunbury region:
- Marley, named after a dingo that took up residence at Bunbury Port
- Kwilena, the Noongar word for dolphin
- Koombana, named after Koombana Bay, north of Bunbury
- Linda, the nickname for the Australind by local train enthusiasts
A community event to mark the resumption of the Australind service was held at Bunbury Terminal on 28 June 2026.[1] The railcars commenced passenger service on 29 June 2026, beginning with one new railcar being used on the route at launch with the rest coming online in the following months.[1]
