Westrail ADP/ADQ class

The Westrail ADP/ADQ class is a retired class of railcars built by Comeng, Bassendean for Westrail in 1987 to operate the Australind service between Perth and Bunbury. Operation and ownership of the fleet was transferred to Transwa when Westrail was superseded by Transwa in 2003.

Westrail ADP/ADQ class
ADP101 and ADP102 passing through Yarloop in October 2020
Refurbished interior
In service	1987–2023
Manufacturer	Comeng
Built at	Bassendean
Refurbished	2003, 2007
Number built	5
Number in service	0
Formation	ADP–ADP ADP–ADQ–ADP ADP–ADQ–ADQ–ADP
Fleet numbers	ADP101–103 ADQ121–122
Capacity	ADP: 38 + 1 Wheelchair ADQ: 58
Operators	Westrail (1987–2000) WAGR Commission (2000–2003) Transwa (2003-2023)
Depots	Claisebrook railway depot
Lines served	South Western
Specifications
Train length	2-car: 42.32 m (138 ft 10 in) 3-car: 63.48 m (208 ft 3 in) 4-car: 86.64 m (284 ft 3 in)
Car length	21.16 m (69 ft 5 in)
Width	2.88 m (9 ft 5 in)
Height	4,115 mm (13 ft 6.0 in)
Floor height	1,185–1,200 mm (3 ft 10.7 in – 3 ft 11.2 in)
Doors	2 per side
Wheel diameter	840 mm (33 in)
Wheelbase	2.5 m (8 ft 2 in)
Maximum speed	120 km/h (75 mph) (design) 110 km/h (68 mph) (service)
Weight	ADP: 48.45 t (47.68 long tons; 53.41 short tons) ADQ: 47.8 t (47.0 long tons; 52.7 short tons)
Prime mover(s)	Cummins KTA 19 R @ 350 kW (470 hp)
Power output	373 kW (500 hp) @ 2100rpm per engine
Transmission	Voith T 311r w/ KB 260 HD (Hydrodynamic braking disconnected)
Power supply	Primary Batteries Type: Lead Acid HD Marine Alternator Voltage: 415 V 50 Hz 3-phase AC +/- 10%
HVAC	Sigma/MR27-MR1 A (1 per car)
Bogies	Fabricated
Braking system(s)	Davies & Netcalf/EBC5 w/ Oerlikon WSP air-actuated disc brakes
Safety system(s)	ATP
Coupling system	Scharfenberg
Track gauge	1,067 mm (3 ft 6 in)

History

In August 1985, Westrail awarded Comeng, Bassendean a contract for five diesel railcars, three ADP carriages with driving cabs and two ADQ trailer carriages, using a similar body shell and interior fitout to the New South Wales XPT carriages.^[1] Each carriage was powered by a Cummins KTA19 engine coupled to a Voith transmission. They usually operate as a four carriage set.^[2][3]

In July 2003, the railcars were painted in a new livery in line with the formation of Transwa. In 2007, the railcars were painted white as part of a refurbishment program. In 2010-2011 new seats were fitted.^[4]

The railcars were all retired in November 2023 upon the commencement of the Victoria Park-Canning Level Crossing Removal Project and Byford Rail Extension, which have closed the line for 18 months.^[5] Upon reopening of the line, they will be succeeded by diesel-powered variants of the Transperth C-series trains.^[6][7][8]

One railcar has been donated to Rail Heritage WA, and it is planned to be moved to their museum in Boyanup.^[9]