NZR P class (1885)
| NZR P class (1885) |
| Type and origin |
| Power type |
Steam |
| Builder |
Nasmyth, Wilson & Co. |
| Serial number |
272–281 |
| Build date |
1885 |
| Total produced |
10 |
|
| Specifications |
Configuration:
|
|
| • Whyte
|
2-8-0 |
| • UIC
|
1′D n2G |
| Gauge |
3 ft 6 in (1,067 mm) |
|
Driver dia. |
41 in (1,041 mm) |
| Length |
50 ft 6 1⁄2 in (15.41 m) |
| Adhesive weight |
27.7 long tons (28.1 t; 31.0 short tons) |
| Loco weight |
32.5 long tons (33.0 t; 36.4 short tons) |
| Tender weight |
20 long tons (20 t; 22 short tons) |
| Fuel type |
Coal |
| Fuel capacity |
2.2 long tons (2.2 t; 2.5 short tons) |
| Water cap |
1,300 imp gal (5,900 l; 1,600 US gal) |
Firebox:
• Firegrate area |
15.8 sq ft (1.47 m2) |
| Boiler pressure |
135 psi (931 kPa) |
| Heating surface |
858 sq ft (79.7 m2) |
| Superheater |
None |
| Cylinders |
Two, outside |
| Cylinder size |
15 in × 20 in (381 mm × 508 mm) |
|
| Performance figures |
| Maximum speed |
20 mph (32 km/h) |
| Tractive effort |
11,415 lbf (50.78 kN) |
|
|
|
| Type and origin |
| Power type |
Steam |
| Builder |
Nasmyth, Wilson & Co. |
| Serial number |
272–281 |
| Build date |
1885 |
| Total produced |
10 |
| Specifications |
Configuration:
|
|
| • Whyte
|
2-8-0 |
| • UIC
|
1′D n2G |
| Gauge |
3 ft 6 in (1,067 mm) |
|
Driver dia. |
41 in (1,041 mm) |
| Length |
50 ft 6 1⁄2 in (15.41 m) |
| Adhesive weight |
27.7 long tons (28.1 t; 31.0 short tons) |
| Loco weight |
32.5 long tons (33.0 t; 36.4 short tons) |
| Tender weight |
20 long tons (20 t; 22 short tons) |
| Fuel type |
Coal |
| Fuel capacity |
2.2 long tons (2.2 t; 2.5 short tons) |
| Water cap |
1,300 imp gal (5,900 l; 1,600 US gal) |
Firebox:
• Firegrate area |
15.8 sq ft (1.47 m2) |
| Boiler pressure |
135 psi (931 kPa) |
| Heating surface |
858 sq ft (79.7 m2) |
| Superheater |
None |
| Cylinders |
Two, outside |
| Cylinder size |
15 in × 20 in (381 mm × 508 mm) |
| Performance figures |
| Maximum speed |
20 mph (32 km/h) |
| Tractive effort |
11,415 lbf (50.78 kN) |
The P class was a class of steam locomotives built to haul freight trains on the national rail network of New Zealand. The class consisted of ten individual locomotives ordered from the British company of Nasmyth, Wilson and Company in 1885, but miscommunications about the weight limitations imposed on the locomotives meant they did not start work until 1887. This debacle came at a time when the New Zealand Railways Department (NZR) was suffering from a lack of motive power to work on its rapidly expanding network and was part of what prompted a shift towards American and home-grown manufacturers.
The classification of this class as "P" was the first example of the re-use of a classification that had previously been used for an earlier class. The members of the P class of 1876 had been sold to private companies or the Public Works Department, leaving the classification unused. The Railways Department chose to assign it to this class, setting a pattern that was followed with other classes in years to come, with the most prominent example being the A class of 1906 re-using the classification of the A class of 1873.
Initially, seven of the P class locomotives were deployed in Otago, with the remaining three based in Auckland, and in 1899, the Auckland fleet expanded to four when one was transferred north from Otago. The locomotives started their lives with wooden cabs in a Gothic style, but they were later replaced with steel cabs.
The P class locomotives were designed primarily for pulling freight trains. However, they were also capable of working passenger trains as required, and photographs exist of the engines occasionally pulling special excursion trains as required. Some changes were found necessary to obtain the best performance from them; the smokeboxes were extended, and the original Belpaire-type boilers were replaced with a new type to an NZR design.
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Wikipedia
