# NZR UA class

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NZR UA class UA class 4-6-0 steam locomotive NZR number 176 Type and origin Power type Steam Builder Sharp Stewart and Company, Glasgow Build date 1899 Total produced 6 Specifications Configuration: ​ • Whyte 4-6-0 Gauge 3 ft 6 in (1,067 mm) Driver dia. 49.125 in (1.248 m) Length 49 ft 3 in (15.01 m) Loco weight 38.2 long tons (38.8 tonnes; 42.8 short tons) Tender weight 24 long tons (24.4 tonnes; 26.9 short tons) Total weight 62.2 long tons (63.2 tonnes; 69.7 short tons) Fuel type Coal Fuel capacity 4.0 long tons (4.1 tonnes; 4.5 short tons) Water cap. 1,700 imp gal (7,700 L; 2,000 US gal) Firebox: ​ • Grate area 16 sq ft (1.5 m2) Boiler pressure 175 lbf/in2 (1,207 kPa) Heating surface: ​ • Tubes 972 sq ft (90.3 m2) Cylinders Two, outside Cylinder size 16 in × 20 in (406 mm × 508 mm) Performance figures Maximum speed 50 mph (80 km/h) Tractive effort 14,591 lbf (64.90 kN) Career Operators NZR Numbers 172-177 Locale Otago, Southland Withdrawn 1933-1936 Disposition Withdrawn, Scrapped Classified U until 1902

The **[NZR](/source/New_Zealand_Railways_Department) UA class** were a class of [4-6-0 Ten Wheeler](/source/4-6-0) locomotive built by the [Scottish](/source/Scotland) firm of [Sharp Stewart and Company](/source/Sharp%2C_Stewart_and_Company) to ease a motive power shortage. They lived relatively short lives amongst NZR ten wheelers, mostly at the southern end of the country where they were seldom photographed.

## Origin and design

As New Zealand rapidly recovered from the 1880s depression, NZR developed a motive power shortage that its own workshops could not keep up with.[1] After his 1898 annual report indicated it was "absolutely necessary" to obtain more locomotives the Locomotive Superintendent obtained permission to buy sixteen 4-6-0 locomotives, ten from [Baldwin](/source/Baldwin_Locomotive_Works), and six from Sharp Stewart and Co. All were delivered in 1899.[1]

Unlike the Addington U class the new locomotives were of uniform appearance, with low mounted running boards and splashers over the drivers. The design was based on and very similar to the U class, differing primarily in the provision of smaller driving wheels delivering higher tractive effort. Although they used the same type of boiler they carried a higher pressure and were fitted with piston valves. Overall their appearance was similar to their predecessors.

## Service

Initially three each were stationed at Invercargill and Dunedin to run express passenger services between those cities. Later the Dunedin-based engines joined their siblings in the south. The only known report from footplate men indicated that while finely built they were difficult to fire. However annual returns indicate that they ran greater annual miles and at lower cost than other 4-6-0's at the time.

Modifications included lengthening the smokebox, a common procedure on many early NZR types, and sand domes were provided, while the running boards were raised. In the 1920s either two or three (sources vary) received superheated boilers of 200 lb sq in working pressure. However, the class was gone before the end of the 1930s, the superheated boilers going to members of the UC class of the same maker. One was reportedly dumped on the Oamaru foreshore.

## See also

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

- [NZR UB class](/source/NZR_UB_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

1. ^ [***a***](#cite_ref-FOOTNOTEPalmerStewart196567_1-0) [***b***](#cite_ref-FOOTNOTEPalmerStewart196567_1-1) [Palmer & Stewart 1965](#CITEREFPalmerStewart1965), p. 67.

### Bibliography

- Lloyd, W. G. (1974). *Register of New Zealand Railways Steam Locomotives 1863-1971* (2nd ed.). Otago Railway and Locomotive Society & Triple M Publications. [ISBN](/source/ISBN_(identifier)) [0-9582072-1-6](https://en.wikipedia.org/wiki/Special:BookSources/0-9582072-1-6).

- 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).

- 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).

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.

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