| 词条 | LNER Class V2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 |
|powertype=Steam |name = LNER Class V2 |image = 60975 at Newstead.jpg |caption = 60975 at Newstead. The lack of outside steam pipes indicates that this locomotive still has monobloc cylinders. |designer = Sir Nigel Gresley |builder = LNER Doncaster and Darlington Works |builddate = 1936–1944 |totalproduction = 184 |whytetype = 2-6-2 |uicclass=1′C1′ h3 |gauge = {{RailGauge|ussg|allk=on}} |leadingdiameter = {{convert|3|ft|2|in|m|3|abbr=on}} |driverdiameter = {{convert|6|ft|2|in|m|3|abbr=on}} |trailingdiameter = {{convert|3|ft|8|in|m|3|abbr=on}} |axleload={{convert|22|LT|t ST}} |length = {{convert|66|ft|5.125|in|m|abbr=on}} |locoweight = |tenderweight = |fueltype = Coal |fuelcap = {{long ton|7|10}} |watercap = {{convert|4200|impgal|abbr=on}} |cylindercount = Three |cylindersize ={{convert|18.5|x|26|in|mm|0|abbr=on}} |diameterinside = {{convert|5|ft|9.2|in|mm|abbr=on}} outside |firearea = {{convert|41.25|sqft|m2|abbr=on}} |totalsurface ={{convert|2431.07|sqft|m2|abbr=on}} |superheaterarea= {{convert|679.67|sqft|m2|abbr=on}} |boilerpressure = {{convert|220|psi|MPa|2|abbr=on}} |tractiveeffort = {{convert|33730|lbf|kN|1|abbr=on}} |operatorclass=LNER: V2 |powerclass=BR: 6MT (later) 7P6F |retiredate=1962–1966 |disposition=One preserved, remainder scrapped }} The London and North Eastern Railway (LNER) Class V2 2-6-2 steam locomotives were designed by Sir Nigel Gresley for express mixed traffic work, and built at the LNER shops at Doncaster and Darlington between 1936–1944. The best known is the first of the class, 4771 (later 800 and 60800) Green Arrow, which is the only preserved example.[1] ConstructionThe V2s were the only major class of 2-6-2 tender locomotives used in Britain. Whilst 2-6-2T tank locomotives were common in the UK, the only other 2-6-2 tender locomotives were the unsuccessful experimental Midland Railway Paget locomotive of 1908, and the two examples of Gresley's LNER Class V4 of 1941. The wheel arrangement allowed the fitting of a large firebox uninhibited by the rear driving wheel, and the front pony truck improved stability at high speeds. The V2 was derived from the Class A1/A3 pacifics with smaller driving wheels (of {{convert|6|ft|2|in|m|3|abbr=on|disp=or}} compared to {{convert|6|ft|8|in|m|3|abbr=on|disp=or}}) and a shortened boiler. It retained Gresley's favoured 3-cylinder arrangement. Unusually all 3 cylinders were part of a single 'monobloc' casting. 184 locomotives were built in 14 batches between 1936 and 1944 at Doncaster and Darlington Works, construction continuing through the Second World War as they proved their usefulness. A further four locomotives, ordered as V2s, were redesigned by Gresley's successor Edward Thompson and completed as Pacifics (LNER Thompson Class A2/1). The V2 was a versatile locomotive, capable of hauling fast fitted freights and express passenger trains. Their relatively heavy 22 ton axle load meant their use was restricted to around 40% of the LNER's route miles. For example, they were barred from all of the former Great Eastern Railway main lines. Gresley recognised that a lighter mixed-traffic locomotive was required, and the V4 class was designed to this end. However, it was to be the versatile LNER Thompson Class B1 4-6-0 which succeeded the V2 as the LNER's standard mixed traffic locomotive, although the B1 never matched the V2's power output. Working lifeFirst of the initial batch for five Doncaster-built V2s was number 4771, which emerged in June 1936 and was promptly named "Green Arrow", after the express freight service for which the locomotives had been built. Successful trials with this quintet led to both Doncaster and Darlington works producing further batches. The final locomotive, number 3695, was delivered from Darlington in July 1944. The V2 had the free steaming qualities that the LNER's operating department required. Not only were they capable of working vacuum braked freights at up to {{convert|60|mph|km/h|0|abbr=on}}, they could deputise for Pacifics on express passenger schedules. In peak condition a V2 could almost match the Pacifics for sustained high speed running. One locomotive was reliably timed at {{convert|93|mph|km/h|0|abbr=on}} on the Yorkshire Pullman while another attained {{convert|101.5|mph|km/h|0|abbr=on}} on a test train. The V2s were recognised as versatile and powerful locomotives by 1939, but their reputation was more firmly established by their remarkable feats of haulage during World War II. Trains of over 20 carriages loaded to {{convert|700|LT}} proved within their abilities. On at least one occasion a single V2 hauled 26 coaches from Peterborough to London. Given this capacity for work it was not surprising that construction was allowed to continue through the war years. The V2s performed equally competently for British Railways, leaving their mark on the East Coast Main Line, the Waverley Route between Carlisle and Edinburgh and on the ex-Great Central main line between London Marylebone and Sheffield. Significant modifications were made to the V2 class during its service life. In 1946 a series of derailments was traced to the design of the leading pony truck, which was unduly sensitive to the often poor track conditions, a legacy of heavy wartime use and lack of maintenance. Modifications to the suspension cured the problem. During the 1950s cracked monoblocs became increasingly frequent, but replacement was expensive and in 1956 the decision was taken to replace the monobloc with separate cylinder castings. Seventy-one engines were thus modified: they can be identified by the presence of external steam pipes from smokebox to cylinders. Finally, around 1960 experiments were made with fitting double chimneys to two V2s. This yielded no significant performance gain, but eight engines were subsequently fitted with Kylchap exhausts. These so-called 'Super V2s' were reckoned to be fully equal in performance to the larger Pacifics. However, plans to fit Kylchap chimneys to the remainder of the class were abandoned once it became clear that replacement with diesel locomotives was imminent. The V2s' swansong came on the Edinburgh—Aberdeen run, working alongside the last LNER A2s and A4s. The entire class was withdrawn from service between 1962 and 1966. Accidents and incidents
{{main|Potters Bar rail accidents}}
NamesOnly eight V2s were named; seven by the LNER and one by BR. The first of the class was named after the express freight train Green Arrow. Five more were named after Regiments and two after public schools. It is probable that more would have been named had the outbreak of war not intervened.
NumberingWhen built, the V2s were numbered 3641–3695 and 4771–4899. Under the LNER 1946 renumbering scheme they were to be renumbered 700-883 but the range 800–983 was allocated before renumbering was completed (19 locomotives briefly carried numbers in the original range).[8] After nationalisation in 1948, British Railways added 60000 to their numbers so they became 60800–60983. BR also gave them the power classification 6MT. WithdrawalAll 184 V2s were withdrawn from stock between Feb 1962 and Dec 1966. The surviving V2 no 4771/60800 Green Arrow was withdrawn in Aug 1962 from Kings Cross shed.[9]
Preservation{{main|LNER Class V2 4771 Green Arrow}}One Class V2 survives. The first of the class 4771 Green Arrow has been preserved as part of the National Collection, and was in use on preserved lines around Britain. On 1 April 2008, it suffered a boiler failure on the North Yorkshire Moors Railway and has since been a static exhibit at the National Railway Museum. Its boiler repairs have been determined as achievable, however the NRM are not currently willing to meet the cost involved in replacing the 'monobloc' cylinder casting. A crack in this means the casting now needs to be replaced before the locomotive can work again. It is unfortunate that 60800 was not one of the V2 class that were modified to incorporate separate cylinder blocks, when a lot of the class were modified in the 1940s and 1950s. ModellingBachmann currently produce a 'OO gauge' model including an updated DCC ready chassis: 31-550B Class V2 Gresley 2-6-2 4771 "Green Arrow" LNER Lined Doncaster Green (as Preserved at the National Railway museum). 31-564 Class V2 Gresley 2-6-2 60860 "Durham School" in BR lined black with early emblem. 31-565 Class V2 Gresley 2-6-2 60862 in BR lined green with late crest and double chimney. Older (pre 2012) Bachmann models had a split chassis design which required a lot of modification to convert to DCC. References1. ^{{cite web|url=http://www.docbrown.info/docspics/ArchiveSteam/loco60800.htm |title=Class V2 60800 GREEN ARROW LNER 4771 Steam Locomotive Gresley 2-6-2 800 images photos pictures photographs |publisher=Docbrown.info |date= |accessdate=2014-06-12}} 2. ^{{cite book |first=Arthur |last=Trevena |title=Trains in Trouble |volume=Vol. 1. |publisher=Atlantic Books |location=Redruth |year=1980 |page=41 |isbn=0-906899-01-X}} 3. ^1 2 {{cite book |last=Hoole |first=Ken |authorlink=Ken Hoole |title=Trains in Trouble: Vol. 3 |year=1982 |publisher=Atlantic Books |location=Redruth |isbn=0-906899-05-2 |pages=35–37, 46 |ref=harv }} 4. ^{{harvnb|Hoole|1982|p=36}} 5. ^1 {{cite book |last=Trevena |first=Arthur |title=Trains in Trouble: Vol. 2. |year=1981 |publisher=Atlantic Books |location=Redruth |isbn=0-906899 03 6 |pages=38, 40–41 }} 6. ^{{cite book |last=Earnshaw |first=Alan |title=Trains in Trouble: Vol. 6 |year=1990 |publisher=Atlantic Books |location=Penryn |isbn=0-906899-37-0 |page=33 }} 7. ^1 {{cite book |last=Hoole |first=Ken |authorlink=Ken Hoole |title=Trains in Trouble: Vol. 4 |year=1983 |publisher=Atlantic Books |location=Truro |isbn=0-906899-07-9 |pages=5–6, 8 }} 8. ^{{cite book |author1=Allan, Ian |author2=Casserley, H. C. |title=abc LNER Locomotives, Renumbering Edition |publisher=Ian Allan |location=Shepperton |year=1975| orig-year=1946 |page=8}} 9. ^http://www.brdatabase.info/locoqry.php?action=class&id=602202&type=S&page=fleet
Literature
External links{{commons category|LNER Class V2}}
5 : London and North Eastern Railway locomotives|2-6-2 locomotives|1′C1′ h3 locomotives|Railway locomotives introduced in 1936|Standard gauge steam locomotives of Great Britain |
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