# NZR UB class

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/NZR_UB_class
> Markdown URL: https://mediated.wiki/source/NZR_UB_class.md
> Source: https://en.wikipedia.org/wiki/NZR_UB_class
> Source revision: 1296225832
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

NZR UB class 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 type Steam Builder Baldwin Locomotive Works (20), Brooks Locomotive Works (1), Richmond Locomotive Works (1) Build date 1898, 1901 Total produced 22 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 weight 57.8 long tons (58.7 tonnes; 64.7 short tons) Fuel type Coal Firebox: ​ • Grate area 16 sq ft (1.5 m2) Boiler pressure 175 lbf/in2 (1,207 kPa) (1898) 200 psi (1,379 kPa) (1901) Heating surface 1,324 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figures Tractive effort 14,590 lbf (64.90 kN) (1898) 16,670 lbf (74.15 kN) (1901) Career Operators NZR Disposition Withdrawn

The **NZR UB class** were a series of [Ten Wheelers](/source/4-6-0) built by American manufacturers for [New Zealand Railways](/source/New_Zealand_Railways_Department) (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](/source/Slide_valves) and inside [Stephenson motion](/source/Stephenson_valve_gear), the later had piston valves and [Walschaerts valve gear](/source/Walschaerts_valve_gear), as well as a higher boiler pressure.

Baldwin-built Ub class 328

## Alco engines

Baldwin NZR Ub class 329

Two additional locomotives were obtained in 1901 from [ALCO](/source/American_Locomotive_Company), one each from Brooks and Richmond.

- The Brooks locomotive (#17) was heavier (30.1 long tons adhesive weight) with attendant increase in tractive effort (18340 lbf), and had a larger grate (17 sq ft). This locomotive was very popular with crews. This locomotive was dumped on the Oamaru foreshore.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

- The Richmond locomotive had less evaporative heating surface but included a superheater. Boiler pressure was lower (180 psi) and tractive effort was marginally lower.

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

## See also

- [NZR U class](/source/NZR_U_class)

- [NZR UA class](/source/NZR_UA_class)

- [NZR UC class](/source/NZR_UC_class)

- [NZR UD class](/source/NZR_UD_class)

- [Locomotives of New Zealand](/source/Locomotives_of_New_Zealand)

## References

### Citations

1. ^ [***a***](#cite_ref-FOOTNOTEPalmerStewart196565_1-0) [***b***](#cite_ref-FOOTNOTEPalmerStewart196565_1-1) [Palmer & Stewart 1965](#CITEREFPalmerStewart1965), p. 65.

### Bibliography

- Millar, Sean (2011). *The NZR Steam Locomotive*. Wellington: [New Zealand Railway and Locomotive Society](/source/New_Zealand_Railway_and_Locomotive_Society). [ISBN](/source/ISBN_(identifier)) [978-0-908573-89-9](https://en.wikipedia.org/wiki/Special:BookSources/978-0-908573-89-9).

- Palmer, A. N.; Stewart, W. W. (1965). *Cavalcade of New Zealand Locomotives*. Wellington: [A H. & A W. Reed](/source/Reed_Publishing). [ISBN](/source/ISBN_(identifier)) [978-0-207-94500-7](https://en.wikipedia.org/wiki/Special:BookSources/978-0-207-94500-7).

- Stewart, W. W. (1974). *When Steam was King*. Wellington: [A. H. & A. W. Reed Ltd](/source/Reed_Publishing). [ISBN](/source/ISBN_(identifier)) [978-0-589-00382-1](https://en.wikipedia.org/wiki/Special:BookSources/978-0-589-00382-1).

v t e Rail vehicles of New Zealand Diesel locomotives Mainline DA (inc. DAA, DAR) DB (inc. DBR) DC (inc. DCP) DF (English Electric) DF (General Motors) inc. DFT, DFB, DFM DG (inc. DH of 1956) DI DJ DL DM DQ and QR DX (inc. DXB, DXC, DXR) Shunt DE DH of 1978 DS DSA DSB DSC DSG DSH (on order) DSJ TR Electric locomotives 1500 V DC EA (later EO of 1968) EC ED EO of 1923 EW 25 kV AC EF Battery E EB Diesel multiple units ADK/ADB class diesel multiple unit ADL/ADC class diesel multiple unit Electric multiple units 1500 V DC (Wellington) "English Electric" DM (inc. D trailers) "Ganz Mavag" EM (inc. ET trailers) "Matangi" FP (inc. FT trailers) "Tūhono" BEMU (on order) 25 kV AC (Auckland) AM (inc. AMP, AMT, AMA) Railcars RM class 88 seater (also known as Fiats or twinsets) Clayton steam railcar Edison battery-electric railcar Red Terror railcar Midland railcar Leyland experimental petrol railcar McEwan Pratt petrol railcar Model T Ford railcar Sentinel-Cammell steam railcar Silver Fern railcar Standard railcar Thomas Transmission railcar Vulcan railcar Wairarapa railcar Westinghouse railcar Others A 88 Buckhurst petrol carriage Steam locomotives A of 1873 A of 1906 (inc. AD) AA AB B of 1874 B of 1899 BA BB BC C of 1873 C of 1930 D of 1874 D of 1929 E of 1872 & 1875 E of 1906 F FA (inc. FB) G of 1874 G Garratt of 1928 (inc. Pacific rebuild) H J of 1874 J of 1939 JA JB K of 1877 K of 1932 KA KB L LA M N NA NC O OA OB OC P of 1876 P of 1885 Q of 1878 Q of 1901 R S T U UA UB UC UD V W WA WAB WB WD WE WF WG WH WJ WS WW X Y Locomotive hauled carriages 50-foot carriage 56-foot carriage AC class (Grassgrubs) ex-British Rail Mark 2 carriage AK carriage FM class guards van SX carriages Track evaluation, cranes, and maintenance ETM class track evaluation car EL class rail cranes ETM class rail maintenance equipment Locomotives of New Zealand Rail transport in New Zealand Railway preservation in New Zealand.

This New Zealand rail-related article is a stub. You can help Wikipedia by adding missing information.

- [v](https://en.wikipedia.org/wiki/Template:NewZealand-rail-transport-stub)
- [t](/source/Template_talk%3ANewZealand-rail-transport-stub)
- [e](https://en.wikipedia.org/wiki/Special:EditPage/Template:NewZealand-rail-transport-stub)

---
Adapted from the Wikipedia article [NZR UB class](https://en.wikipedia.org/wiki/NZR_UB_class) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/NZR_UB_class?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.