| Tasmanian Government Railways Y class | |
| Powertype: | Diesel-electric |
| Builder: | Tasmanian Government Railways Inveresk |
| Builddate: | 1961–1971 |
| Totalproduction: | 8 |
| Uicclass: | Bo-Bo |
| Wheeldiameter: | 3feet |
| Minimumcurve: | 2503NaN3 |
| Wheelbase: | 23feet total, 83NaN3 bogie |
| Length: | 44feet over buffers, 41feet over headstocks |
| Width: | 8feet |
| Height: | 12feet |
| Axleload: | 14.5LT |
| Locoweight: | 58LT |
| Fueltype: | Diesel |
| Fuelcap: | 5003NaN3 |
| Lubecap: | 953NaN3 |
| Primemover: | English Electric 6SRKT Mk II |
| Rpmrange: | 850 rpm max |
| Enginetype: | four stroke, four valves per cylinder |
| Aspiration: | turbocharged |
| Tractionmotors: | English Electric 537 |
| Cylindercount: | Inline 6 |
| Cylindersize: | 10x |
| Multipleworking: | 90V, nine notch electro-magnetic control |
| Poweroutput: | 825-1NaN-1 gross, 750-1NaN-1 net |
| Tractiveeffort: | 340001NaN1 at 6-1NaN-1 |
| Locobrakes: | straight air, proportional control |
| Trainbrakes: | Vacuum (Y1 & Y5 later converted to air) |
| Operator: | Tasmanian Government Railways |
| Numinclass: | 8 |
| Fleetnumbers: | Y1-Y8 |
| Firstrundate: | 1961 |
| Currentowner: | TasRail |
| Disposition: | 7 preserved, 1 converted to driving van |
The Y class is a class of diesel locomotives built by the Tasmanian Government Railways between 1961 and 1971.
The Y class were designed by English Electric and constructed by the Tasmanian Government Railways' Inveresk Workshops. Eight were built as mainline freight and passenger locomotives between 1961 and 1971.[1]
Following the success of the X class, the Tasmanian Government Railways decided to order additional diesel locomotives.
English Electric submitted plans that were quite similar to the Jamaican Railways 81 class, South Australian Railways 800 class and Midland Railways of Western Australia F class but with a small power increase. They were slightly larger and more powerful than the X class.[1] They had a similar layout to the X class, a long hood unit with the cab at one end.
Construction began at the TGR's Inveresk Workshops in 1961, and three of the planned eight were completed relatively quickly. However, construction of the other five was slow, with the last not being delivered until 1971, by which time the design had become dated.
The Y class were fitted with an English Electric 6SRKT Mark II (Mark III on last two) in-line six turbocharged diesel engine. They have a Bo-Bo wheel arrangement and end-platforms, making them visually different from the X class.[1]
In line with standard TGR practice of the time, they were fitted with hook-and-link couplers and vacuum train brakes (air on locomotive). With a light tractive weight of only 58 tonnes, a reasonably powerful engine of and a fairly basic bogie design, gaining traction on long uphill grades was found to be difficult. They were noted to have a tendency to wheel-slip badly. Nevertheless, they were considered successful.
In March 1978, the Y class were included in the transfer of the Tasmanian Government Railways to Australian National. With the new transfer of twenty 830 class locomotives from South Australia and later purchase of ZB class and ZC class locomotives from Queensland Rail, the Y class were made redundant.
In the late 1970s and early 1980s, all members of the Y class were retrofitted with stronger automatic couplers, which had by then become standard equipment. Y1 & Y5 also received air train brakes in 1985,[2] with the others withdrawn following the cessation of vacuum braked services in 1988. Most of these were being preserved at this stage. With Y2 going to Derwent Valley Railway, Y3 going to Queen Victoria Museum & Art gallery, Launceston, Y4 to Tasmanian Transport Museum and finally Y6&8 to Don River Railway. With Tasrail retaining Y7 for parts.[3]
Y7 was rebuilt in 2001 as a driving van for use on Railton to Devonport cement trains. With this finally stored in 2017.[4] Two members of the class remained in regular service with TasRail, renumbered as the 2150 class, until mid 2016 when stored out of use. In its twilight years, Y1 had been modified with reinforced side windows, an extra window on the front door and sealed headlights, as well as a repaint into Tasrail yellow and grey. Y5 received much of the same modifications, except it retained its reverse AN yellow and green.
In May 2022, Y1 (2150) & Y5 (2151) where donated for preservation to Derwent Valley Railway and Launceston & North East Railway respectively. Only leaving DV1, formally Y7, not preserved.
| Image | Original no | Final no | Name | Owner | Status |
|---|---|---|---|---|---|
| Y1 | 2150 | Derwent Valley Railway | Preserved | ||
| Y2 | Henry Baldwin | Derwent Valley Railway | Preserved, operational[5] | ||
| Y3 | Queen Victoria Museum and Art Gallery, Launceston | Preserved | |||
| Y4 | Rowallan | Tasmanian Transport Museum, Glenorchy | Preserved, operational[6] | ||
| Y5 | 2151 | Sir Charles Gairdner | Launceston & North East Railway | Preserved | |
| Y6 | Don River Railway, Devonport | Preserved, operational[7] | |||
| Y7 | DV1 | TasRail | Stored | ||
| Y8 | Don River Railway, Devonport | Preserved, derelict | |||