| 词条 | NZR X class |
| 释义 |
| name= NZR X class | powertype= Steam | image=File:"X" class (compound) steam locomotive 588, 4-8-2 type. ATLIB 257736.png | caption=X class 588, photographed leaving Petone Workshops circa 1913. Godber Collection, Alexander Turnbull Library. | builddate=1908 - 1909, 1913 - 1915 1943 - 1949 (rebuild) | builder= NZR Addington Workshops | locoweight= {{convert|66.7|LT|t ST|lk=on}} (original) {{convert|66.6|LT|t ST|lk=on}} (rebuild) | tenderweight= {{convert|27.3|LT|t ST|lk=on}} (original) {{convert|28.55|LT|t ST|lk=on}} (rebuild) | locotenderweight= {{convert|94.0|LT|t ST|lk=on}} (original) {{convert|95.15|LT|t ST|lk=on}} (rebuild) | whytetype= 4-8-2 | firstrundate= 1909 | lastrundate= 1957 | disposition= Withdrawn, one preserved | numinclass= 18 | weightondrivers= {{convert|46.7|LT|t ST|lk=on}} (original) {{convert|45.6|LT|t ST|lk=on}} (rebuild) | driverdiameter = {{convert|45|in|m|3|abbr=on}} | totalsurface = {{convert|2066|sqft|m2|abbr=on}} (original) {{convert|1185|sqft|m2|abbr=on}} (rebuild) | wheelbase= | boilerpressure= {{convert|230|psi|kPa|0|abbr=on|lk=on}} (original) {{convert|215|psi|kPa|0|abbr=on|lk=on}} (rebuild) | gauge= {{RailGauge|3ft6in|lk=on}} | currentowner= Feilding & Districts Steam Rail Society (1) | cylindercount= 2 high pressure + 2 low pressure (original) 4 high pressure (rebuild) | hpcylindersize= {{convert|13.5|x|22|in|mm|0|abbr=on}} | lpcylindersize= {{convert|22|x|22|in|mm|0|abbr=on}} | poweroutput= | tractiveeffort= {{convert|26620|lbf|kN|abbr=on|lk=on}} (original)/ {{convert|31150|lbf|kN|abbr=on}} (starting) {{convert|29500|lbf|kN|abbr=on|lk=on}} (rebuild) | maxspeed= {{convert|30|mph|km/h|abbr=on}} | retiredate= 1935–1950 | restoredate= | scrapdate= | locale= North Island Main Trunk | fleetnumbers=439–446 588–597 | length= {{convert|56|ft|9.75|in|m|2|abbr=on}} | height= | width= | fueltype= Coal | fuelcap= {{convert|4.0|LT|t ST|lk=on}} (original) {{convert|5.0|LT|t ST|lk=on}} (rebuild) | watercap= {{convert|2200|impgal|L USgal|abbr=on}} | firearea= {{convert|37.1|sqft|m2|1}} (original) {{convert|37.5|sqft|m2|1}} (rebuild) | superheaterarea= None (original) {{convert|168|sqft|m2|1}} (rebuild) }} The New Zealand X class was a pioneering class of eighteen 4-8-2 steam locomotives built for New Zealand Railways Department (NZR) and designed by A. L. Beattie that operated on the national rail network of New Zealand. In 1908, a heavy and powerful locomotive was required to haul traffic on the newly completed mountainous central section of the North Island Main Trunk Railway, and as a logical progression of the 4-6-2 Q class design, the 4-8-2 wheel arrangement was created for the X class.{{sfn|Palmer & Stewart|1965|p=86}} OverviewWhen the first X was completed in 1908 at NZR's Addington Workshops in Christchurch, it was the very first 4-8-2 locomotive built in the world. The 4-8-2 design went on to be popular in the United States and was nicknamed the "Mountain" type; one theory suggests this name stems from the mountainous terrain that inspired the X's design,{{sfn|Palmer & Stewart|1965|p=86}} while another suggests the Chesapeake and Ohio Railway first coined the name in reference to its 4-8-2s of 1911 that were built to operate in the Allegheny Mountains. The X class initially operated as the freight counterpart of the passenger A class, but they struggled to operate at speeds higher than 50km/h (30mph).{{sfn|Palmer & Stewart|1965|p=86}} They were built as de Glehn compound locomotives, but during the 1940s, most of the class were converted to simple, superheated locomotives.{{sfn|Palmer & Stewart|1965|p=121}} This increased their power but did not prolong their lives and most were officially withdrawn from service on 2 March 1957,{{sfn|Palmer & Stewart|1965|p=121}} though a few had been taken out of service earlier and two were sold to the Ohai Railway Board (ORB) in 1946 that operated a private industrial line at the end of the Wairio Branch. PreservationWhen the ORB introduced diesel locomotives in 1968 X 442 was donated to the New Zealand Railway and Locomotive Society, and it was eventually stored at Ferrymead in Christchurch.{{sfn|Cavalcade125|1988|p=7}} In 2002 X 442 was relocated to the Feilding and District Steam Rail Society depot in Feilding.[1] Two X class boilers are held by Mainline Steam. References1. ^{{cite web|url=http://steamrail.org.nz/vehicles/x442/x442info.html|title=X 442 Information|publisher=Feilding and District Steam Rail Society|accessdate=23 March 2019}} Further reading{{refbegin}}
External links
7 : Steam locomotives of New Zealand|4-8-2 locomotives|Compound locomotives|3 ft 6 in gauge locomotives of New Zealand|Railway locomotives introduced in 1908|2′D1′ h4v locomotives|2′D1′ h4 locomotives |
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