- NZR OB class
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NZR OB class Power type Steam Builder Baldwin Locomotive Works Serial number 9018, 9021 Build date 1888 Total produced 2 Configuration 2-8-0 UIC classification 1′C n Gauge 3 ft 6 in (1,067 mm) Driver diameter 43 in (1.092 m) Length 51 ft 3 in (15.62 m) Weight on drivers 34 tons 6 cwt (76,800 lb or 34.8 t) Locomotive weight 38 tons 10 cwt (86,200 lb or 39.1 t) Tender weight 19 tons 2 cwt (42,800 lb or 19.4 t) Fuel type Coal Fuel capacity 3 tons 10 cwt (7,800 lb or 3.5 t) Water capacity 1,500 imp gal (6,800 l; 1,800 US gal) Boiler pressure 165 lbf/in² (1.14 MPa) Firegrate area 16.5 sq ft (1.53 m2) Heating surface:
Total1,013 sq ft (94.1 m2) Cylinders Two, outside Cylinder size 16 × 20 in (406 × 508 mm) Valve gear Stephenson Valve type Slide valves Tractive effort 15,177 lbf (67.51 kN) Career Wellington and Manawatu Railway
New Zealand Government RailwaysNumber WMR 11, 12
NZR 455, 456Locale Wellington - Longburn section Retired 1931, 1929 Disposition Withdrawn The OB class was the first class of steam locomotives constructed by the Baldwin Locomotive Works for the Wellington and Manawatu Railway (WMR) in New Zealand. The class consisted of two locomotives ordered in 1888, and they entered service in September of that year as WMR No.'s 11 and 12. When the WMR and its locomotive fleet was acquired by the government and merged into the national New Zealand Railways (NZR) in 1908, the two locomotives were considered to be similar to the O class but sufficiently different to warrant the separate OB classification. No. 11 became OB 455 and No. 12 became OB 456, and they ended their days working around Napier. OB 456 was retired in September 1929, and was followed in March 1931 by OB 455, which had survived to be one of the final operating locomotives of WMR heritage, along with NC 461 and edit] External links
- New Zealand Steam locomotives — OB class
- Baldwin Steam Trust's page of Baldwin locomotives built for the WMR - includes OB class
- Drawing of an OB class locomotive from Derek Brown
Categories:- New Zealand rail transport stubs
- Locomotives of New Zealand
- 2-8-0 locomotives
- Baldwin locomotives
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