| WAGR Msa class | |
|---|---|
| Works photo of Msa468, taken in 1930. | |
| Power type | Steam |
| Builder | WAGR Midland Railway Workshops |
| Serial number | 46–55 |
| Build date | 1930 |
| Total produced | 10 |
| Configuration | 2-6-0+0-6-2 |
| UIC classification | (1′C)(C1′) h4t |
| Gauge | 3 ft 6 in (1,067 mm) |
| Driver diameter | 39 in (991 mm) |
| Weight on drivers | 60 tonnes (59 long tons; 66 short tons) |
| Locomotive weight | 74 tonnes (73 long tons; 82 short tons) |
| Boiler pressure | 160 lbf/in² (1.10 MPa) |
| Firegrate area | 27 sq ft (2.5 m2) |
| Heating surface: Total |
1,088 sq ft (101.1 m2) |
| Superheater area | 180 sq ft (17 m2) |
| Cylinders | Four (Garratt) |
| Cylinder size | 13.25 × 20 in (337 × 508 mm) |
| Tractive effort | 24,489 lbf (108.93 kN) |
| Career | Western Australian Government Railways |
| Class | Msa |
| Number | 466–475 |
The WAGR Msa class was a class of Garratt steam locomotive constructed at the Western Australian Government Railways Midland Railway Workshops in Australia.
The class was preceded on the WAGR system by the M and the Ms Garratts. The class were used extensively on WAGR lines with light rails and sharp curves, as a consequence many of the smaller older branch lines on the Darling Scarp; as well as those with steep inclines such as those on the Mundaring Weir Branch Railway, the Nannup Branch, and the Flinders Bay Branch Railway railways.
Hearsay evidence suggests that the poor quality of the boilers in the Msa rendered some inoperable by the late 1940s. The last remaining Msa was awaiting moving to a preservation status in the 'steam graveyard' adjacent to the Midland Railway Workshops, when instructions were misunderstood by a scrap metal company employee, and it was destroyed.