NZR UB class

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NZR UB class
UB locomotive NZ (cropped).jpg
UB class in the United States, prior to being delivered to New Zealand. The locomotive was renumbered no. 371 by NZR. A P Godber Collection, Alexander Turnbull Library
Type and origin
Power typeSteam
Builder Baldwin Locomotive Works (20), Brooks Locomotive Works (1), Richmond Locomotive Works (1)
Build date1898, 1901
Total produced22
Specifications
Configuration:
   Whyte 4-6-0
Gauge 3 ft 6 in (1,067 mm)
Driver dia.49.125 in (1.248 m)
Adhesive weight 26.4 long tons (26.8 tonnes; 29.6 short tons)
Total weight57.8 long tons (58.7 tonnes; 64.7 short tons)
Fuel type Coal
Firebox:
  Grate area16 sq ft (1.5 m2)
Boiler pressure175 lbf/in2 (1,207 kPa) (1898)
200 psi (1,379 kPa) (1901)
Heating surface1,324 sq ft (123.0 m2)
Cylinders Two, outside
Cylinder size 16 in × 20 in (406 mm × 508 mm)
Performance figures
Tractive effort 14,590 lbf (64.90 kN) (1898)
16,670 lbf (74.15 kN) (1901)
Career
Operators NZR
DispositionWithdrawn

The NZR UB class were a series of Ten Wheelers built by American manufacturers for New Zealand Railways (NZR) around the start of the twentieth century. Two batches were built by Baldwin in 1898 and 1901 (ten each). [1] The earlier batch of engines had slide valves and inside Stephenson motion, the later had piston valves and Walschaerts valve gear, as well as a higher boiler pressure.

Contents

Baldwin-built Ub class 328 Ub class steam locomotive 328, 4-6-0 type. ATLIB 277681.png
Baldwin-built Ub class 328

Alco engines

Baldwin NZR Ub class 329 N Z R Ub class 329.jpg
Baldwin NZR Ub class 329

Two additional locomotives were obtained in 1901 from ALCO, one each from Brooks and Richmond.

The locomotives were initially assigned to Dunedin to Christchurch expresses and were reassigned as newer power replaced them. The last assignment for the class was on the West Coast Region. [1]

See also

References

Citations

Bibliography

  • Millar, Sean (2011). The NZR Steam Locomotive. Wellington: New Zealand Railway and Locomotive Society. ISBN   978-0-908573-89-9.
  • Palmer, A. N.; Stewart, W. W. (1965). Cavalcade of New Zealand Locomotives. Wellington: A H. & A W. Reed. ISBN   978-0-207-94500-7.
  • Stewart, W. W. (1974). When Steam was King. Wellington: A. H. & A. W. Reed Ltd. ISBN   978-0-589-00382-1.