| Western Australian Government Railways R class | |
| Powertype: | Diesel-electric |
| Serialnumber: | A.166-A.167, A.171, A.173-A.174 |
| Builddate: | 1968 |
| Totalproduction: | 5 |
| Aarwheels: | C-C |
| Uicclass: | Co-Co |
| Bogies: | English Electric low weight transfer |
| Wheeldiameter: | 3feet |
| Minimumcurve: | 2643NaN3 |
| Wheelbase: | 40feet total, 11feet bogie |
| Length: | 503NaN3 over headstocks |
| Width: | 9feet |
| Height: | 133NaN3 |
| Axleload: | R1901-R1902: 15LT, R1903-R1905: 16LT |
| Locoweight: | R1901-R1902: 88LT R1903-R1905: 95.5LT |
| Fueltype: | Diesel |
| Fuelcap: | 1200impgal |
| Coolantcap: | 200impgal |
| Primemover: | EE 12CSVT Mk II |
| Rpmrange: | 850rpm |
| Enginetype: | four stroke, four valves per cylinder |
| Aspiration: | turbo, intercooled |
| Generator: | EE822/16J |
| Tractionmotors: | EE548 |
| Cylindercount: | 12 Vee |
| Cylindersize: | 10x |
| Multipleworking: | 110V, stepless electro-pneumatic throttle |
| Poweroutput: | 1950-1NaN-1, gross, 1795-1NaN-1 net |
| Tractiveeffort: | 505001NaN1 at 10.8-1NaN-1 |
| Locobrakes: | Air, proportional control, dynamic |
| Trainbrakes: | Dual air and vacuum |
| Operator: | Western Australian Government Railways |
| Numinclass: | 5 |
| Fleetnumbers: | R1901-R1905 |
| Firstrundate: | February 12th, 1968 |
| Disposition: | 5 scrapped |
The R Class are diesel locomotives built by English Electric, Rocklea for the Western Australian Government Railways in 1968. They were followed by the revised RA class.
The R class were a hood type general purpose diesel-electric locomotive. They were similar to the Queensland Railways 1300 class. All equipment, except traction motors, were interchangeable with the standard gauge K class. The bogies are an English Electric design with low weight transfer characteristics. They feature fully equalised primary spring gear, all traction motors in each bogie mounted with the nose-suspension facing inwards, traction thrust at near axle level and long pivot centres to reduce inter-bogie transfer. Adhesion loss at maximum tractive effort is limited to 4.5 per cent allowing 1830LT trailing load to be hauled up a 1 in 100 grade.[1]
In 1968 the Western Australian Government Railways took delivery of five narrow gauge versions of the K class for use on bauxite traffic, the last three being fitted with of ballast to improve their tractive effort. All were fitted with dynamic brakes.[2] [3] [4]
| Serial number | Entered service | Road number | Last owner | Status | |
|---|---|---|---|---|---|
| A.166 | 12 February 1968 | R1901 | Westrail | Scrapped, Midland Workshops (October 1992) | |
| A.167 | 15 March 1968 | R1902 | Greentrains | Scrapped, Bellevue (28 May 2016) | |
| A.171 | 2 May 1968 | R1903 | Westrail | Scrapped, Midland Workshops (October 1992) | |
| A.173 | 14 June 1968 | R1904 | Westrail | Scrapped, Midland Workshops (October 1992) | |
| A.174 | 26 June 1968 | R1905 | Westrail | Scrapped, Midland Workshops (October 1992) |