| 词条 | NZR G class (1874) |
| 释义 |
| name = NZR G Class (1874) | image = G Class steam locomotive, NZR 55, 4-4-0T ATLIB 276467.png | alt = | caption = G Class steam locomotive, NZR 55 | builder = Black, Hawthorn & Co (4) | builddate = 1873 | whytetype = 4-4-0T | driverdiameter = {{convert|36|in|m|3|abbr=on}} | locoweight = {{convert|18.2|LT|t ST|1|abbr=off}} | weightondrivers = {{convert|13.2|LT|t ST|1|abbr=on}} | boilerpressure = {{convert|130|lbf/in2|MPa|2|abbr=on}} | firearea = {{convert|9|sqft|m2|abbr=on}} | totalsurface = {{convert|486|sqft|m2|abbr=on}} | cylindercount = Two, outside | cylindersize = {{convert|10.5|x|18|in|mm|0|abbr=on}} | tractiveeffort = {{convert|4893|lbf|kN|2|abbr=on}} | operator = NZR | disposition = All scrapped }} The NZR G Class was a class of four saddle tank locomotives from English builders Black Hawthorn in the early 1870s. Like the similarly sized D class, they were an attempt to produce a passenger version of the already highly successful F class. Origin and designThe G class were ordered by the Canterbury Provincial Council. They were derived from the F class, replacing the first of the three driving axles with a four-wheel bogie. It was hoped that the reduced rigid wheelbase would allow the locomotive to provide higher speed passenger services. The type suffered from lack of weight on the driving axles, a driver stating that "it took the 'G' all its time to push its front bogie along, let alone pull a load".{{sfn|Millar|2011|p=108}} They were followed by the L Class which were a more successful attempt to produce a faster F Class. ServiceIn the early 1890s the locomotives were progressively transferred to the Picton section, where it was felt that they had been relegated to get rid of them from the busy Hurunui-Bluff section. Their maximum load on the 1 in 37 gradient from Picton was six 4-wheel wagons.[1] Withdrawal & DisposalAll of the locomotives were withdrawn between 1915 and 1919 and were sold for further service in industry. Notes and referencesNotes1. ^{{Cite journal|last=Boult|first=A A|date=Sep 1960|title=The G Class 4-4-0 tank locomotives|url=|journal=Railway Observer|volume=85 (reprinted Oct 2017)|pages=160-161|via=}} References{{refbegin}}
2 : Steam locomotives of New Zealand|Scrapped locomotives |
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