Queensland PB15 class locomotive
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | Henry Horniblow & LW Piggott |
| Builder |
Evans, Anderson, Phelan & Co (70) North Ipswich Railway Workshops (1) Kitson & Co (20) Toowoomba Foundry (20) Walkers Limited (122) |
| Build date | 1899-1926 |
| Total produced | 233 |
| Specifications | |
|---|---|
| Configuration | 4-6-0 |
| Gauge | 1,067 mm (3 ft 6 in) |
| Leading dia. | 2 ft 2 in (660 mm) |
| Driver dia. | 4 ft 0 in (1,219 mm) |
| Length | 47 ft 6 in (14.48 m) |
| Axle load | 8.1 tonnes (8.0 long tons; 8.9 short tons) |
| Loco weight | 32 tonnes (31.5 long tons; 35.3 short tons) |
| Tender weight | 24 tonnes (23.62096 long tons; 26.45547 short tons) |
| Total weight | 56 tonnes (55.115566 long tons; 61.729433 short tons) |
| Fuel type | Coal |
| Fuel capacity | 4 tonnes (3.9 long tons; 4.4 short tons) |
| Water cap | 2,500 imperial gallons (11,000 l; 3,000 US gal) |
| Firebox: • Firegrate area |
12 sq ft (1.1 m2) |
| Boiler pressure | 150 psi (1,034 kPa) later upgraded to 160 psi (1,103 kPa) |
| Heating surface: • Tubes and flues |
780 sq ft (72 m2) |
| Cylinders | 2 outside |
| Cylinder size | 15 in × 20 in (381 mm × 508 mm) |
| Valve gear |
Stephenson (locos built 1899–1912) Walschaerts (locos built 1924–26) |
| Performance figures | |
|---|---|
| Tractive effort | 12,750 lbf (56.71 kN) |
| Career | |
|---|---|
| Operators | Queensland Railways |
| Numbers | 347-362, 385-384, 404-413, 434-509, 518-537, 540-609, 12, 5, 103, 126, 128, 143, 220, 286, 339, 340, 731-751 |
| Preserved | 444, 448, 454, 732, 738 |
| Disposition | 5 preserved, 228 scrapped |
The Queensland Railways PB15 class locomotive was a class of 4-6-0 steam locomotives operated by the Queensland Railways.
The design resulted from a need for more powerful engines for passenger trains. The PB15 Class was designed by Locomotive Engineer, Henry Horniblow and LW Piggott. Per Queensland Railway's classification system they were designated the PB15 class, P representing they were a passenger locomotive, the B that they had three driving axles and the 15 the cylinder diameter in inches. The PB15s were in essence identical to the B15 class.
The first PB15 engines were delivered by Walkers Limited, Maryborough in December 1899. By 1912, a total of 202 had been built by Walkers (122), Evans, Anderson, Phelan & Co (70), Kitson & Co (20) and Toowoomba Foundry (20). They were fitted with Stephenson valve gear. In May 1918, no. 411 was converted at North Ipswich Railway Workshops into a tank engine, the one off member of the 6D15 class. In March 1922 however, due to poor performance it was converted back to its original tender form.
In 1924 one example was built by North Ipswich Railway Workshops for the Aramac Shire Tramway. It was acquired by Queensland Railways in 1958.
In 1925/26, Walkers manufactured a further 30 improved PB15 Class locomotives. These were fitted with larger tenders and Walschaerts valve gear. This earned this variant of the PB15 the nickname Walschaerts.
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Wikipedia