NZR T class
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| Type and origin | |
|---|---|
| Power type | Steam |
| Builder | Baldwin Locomotive Works, United States |
| Serial number | 4660–4661, 4664-4667 |
| Build date | 1879 |
| Total produced | 6 |
| Specifications | |
|---|---|
| Configuration: |
|
| • Whyte | 2-8-0 |
| • UIC | 1′D |
| Gauge | 3 ft 6 in (1,067 mm) |
| Driver dia. | 36 in (914 mm) |
| Length | 44 ft 10 in (13.67 m) |
| Adhesive weight | 23.0 long tons (23.4 t; 25.8 short tons) 24.7 long tons (25.1 t; 27.7 short tons) (reboilered) |
| Loco weight | 26.2 long tons (26.6 t; 29.3 short tons) |
| Tender weight | 16.0 long tons (16.3 t; 17.9 short tons) |
| Fuel type | Coal |
| Fuel capacity | 2.1 long tons (2.1 t; 2.4 short tons) |
| Water cap | 1,300 imp gal (5,900 l; 1,600 US gal) |
| Firebox: • Firegrate area |
15.7 sq ft (1.46 m2) |
| Boiler pressure | 130 psi (896 kPa) 160 psi (1,103 kPa) (reboilered) |
| Heating surface | 812 sq ft (75.4 m2) 920 sq ft (85 m2) (reboilered) |
| Superheater | None |
| Cylinders | Two, outside |
| Cylinder size | 15 in × 18 in (381 mm × 457 mm) |
| Performance figures | |
|---|---|
| Maximum speed | 18 mph (29 km/h) |
| Tractive effort | 11,700 lbf (52.04 kN) 14,300 lbf (63.61 kN) (reboilered) |
| Career | |
|---|---|
| Operators | New Zealand Railways |
| Numbers | 101–106 |
| Locale | All of New Zealand |
| First run | 1880 |
| Disposition | Withdrawn, none preserved |
The NZR T class was a class of steam locomotive used in New Zealand.
By the late 1870s there was a distinct need for a powerful type of locomotive to operate the steep section of the Main South Line between Dunedin and Oamaru. As the success of the K class demonstrated the suitability of American locomotives to New Zealand's railways, an order was placed with the Baldwin Locomotive Works in 1879 for six 2-8-0 tender locomotives. Based on a design already used for the Denver and Rio Grande, it was much less decorative than the K class, but this did not detract from its performance capabilities. The largest and most powerful locomotives in the country upon their introduction, the backhead of the boiler protruded a very long way into the cab leaving very little room for the driver or fireman.
Because of its small diameter driving wheels, the T class was typically limited to a speed of 29 km/h (18 mph). Accordingly, it was usually assigned to freight trains. In their heyday, the T class generally hauled services on the Otago Central Railway and the Main South Line between Dunedin and Oamaru. Around the beginning of the 20th century, the class received new boilers of a Belpaire design, fitted with Westinghouse air brakes and two were moved north to Auckland to assist on the newly opened North Island Main Trunk Railway. Most were also fitted with steel cabs in place of the original wooden ones, although the design fitted varied from locomotive to locomotive.
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