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| O54 | O55 |
This is the first locomotive to have the O class classification (see O 204 for second O class).
The two engines forming the O class were broad gauge engines imported from the United States of America for use on goods services on the Adelaide hills line. When introduced, they were the largest locomotives in service on the South Australian Railways. They were not very successful performers on the hills line and consequently were diverted to the north line. Orginally these engines where designated as the M class, but it was sometime later changed to O class.
| Class: | O | |
| Builder: | Baldwin Locomotive Works - Philadelphia, USA | |
| Introduced: | 1881 | |
| Number in Class: | 2 | |
| Wheel Arrangement: | 2-8-0 (1′D 2′2′) | |
| Driving Wheel Diameter: | 4 ft. 0 in. | |
| Cylinders: | Number: | 2 |
| - | Position on frame: | Outside |
| - | Diameter x stroke: | 20 in. x 24 in. |
| Heating Surface: | Tubes and Firebox: | 1,184 square feet |
| Boiler Pressure: | 130 lbs p.s.i. | |
| Tractive Effort: | 22,100 lbs | |
| Coal Capacity: | 6 tons 1 cwt 1 qtr | |
| Water Capacity: | 2,800 gallons | |
| Weight in Working Order: | 77 tons 1 cwt | |
| Overall Length | 53 ft. 5¼ in. | |
"Baldwin Locomotive Works" built 2-8-0 type broad gauge steam locomotive.
| 25.2.1881 | Entered service as "M 54". Built by Baldwin Locomotive Works, builders No.5228. Arrived 1.1881 ex ship "John Lachlan". [nrm] |
| - | Reclassified "O 54" [nrm] |
| 12.12.1904 | Condemned [nrm] |
"Baldwin Locomotive Works" built 2-8-0 type broad gauge steam locomotive.
| 16.3.1881 | Entered service as "M 55". Built by Baldwin Locomotive Works, builders No.5227. Arrived 1.1881 ex ship "John Lachlan". [nrm] |
| - | Reclassified "O 55" [nrm] |
| 12.12.1904 | Condemned [nrm] |
