| Queensland PB15 class | |
|---|---|
| PB15 No. 448 at Swanbank | |
| Power type | Steam |
| Designer | Henry Horniblow and L. W. Piggott. |
| Builder | Evans, Anderson, Phelan & Co. (70,) Ipswich workshops (1), Kitson & Co. (20), Toowoomba Foundry (20), Walkers Ltd (122) |
| Build date | 1899–1926 |
| Total produced | 233 |
| Configuration | 4-6-0 |
| UIC classification | 2′C n2 |
| Gauge | 3 ft 6 in (1,067 mm) |
| Driver diameter | 48 in (1.22 m) |
| Length | 47 ft 6 in (14.48 m) |
| Axle load | 8 long tons (8.1 t) |
| Water capacity | 2,500 imperial gallons (11,000 l; 3,000 US gal) |
| Boiler pressure | 160 psi (1.10 MPa) |
| Firegrate area | 12 sq ft (1.1 m2) |
| Heating surface: Tubes and flues |
780 sq ft (72 m2) |
| Superheater type | None |
| Cylinders | Two, outside |
| Cylinder size | 15 × 20 in (381 × 508 mm) |
| Valve gear | Stephenson (locos built 1899–1912) Walschaerts (locos built 1924–26) |
| Tractive effort | 12,750 lbf (56.71 kN) |
| Career | Queensland Railways |
| Number | 347–362, 385–384, 404–413, 434–509, 518–537, 540–609, 12, 5, 103, 126, 128, 143, 220, 286, 339, 340, 731–751 |
| Disposition | Five preserved, remainder scrapped |
The PB15 class locomotive was a 4-6-0 locomotive of the Queensland Railways. The locomotives operated on 1,067 mm (3 ft 6 in) gauge.
Contents |
The design resulted from a need for more powerful engines for passenger trains. The PB15 Class was designed by Locomotive Engineer, Henry Horniblow and L. W. Piggott. The “P”, which was used to denote “Passenger”, was added to the classification of the new locomotives to distinguish them from the earlier B15 Class, which were primarily goods engines. The “B”, is used to identify the number of coupled wheels, being six coupled wheels for the PB15 class, followed by numerals indicating the cylinder diameter of fifteen inches. The PB15s were in essence identical to the B15s.
The first PB15 engines were delivered by Walkers Ltd, Maryborough in April 1900. The original locomotives delivered between 1900 and 1912 were fitted with Stephensons Valve Gear. Walkers Ltd manufactured a further 30 improved PB15 Class locomotives between 1924 and 1926 and these were fitted with Walschaerts Valve Gear. This earned this variant of the PB15 the nickname Walschaerts. At the height of their service there were approximately 230 locomotives in service in Queensland.
Five have been preserved:
Some of the class were built at Ipswich workshops and some by Walkers Limited, Engineers, Maryborough, Queensland.
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