| 词条 | GWR 5101 Class | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 |
|name= GWR 5101 Class |powertype= Steam |image=GWR Prairie Class 5100 No 5164 (8062220732).jpg |imagesize=300 |caption= Preserved 5101 Class locomotive 5164 at Bridgnorth, Severn Valley Railway, painted in Great Western green livery. |designer= Charles Collett |builder= GWR Swindon Works |builddate= 1929–1949 |totalproduction= 140 |whytetype= 2-6-2T |uicclass=1′C1′ h2t |gauge= {{track gauge|56.5in|allk=on}} |leadingdiameter= {{convert|3|ft|2|in|3|abbr=on}} |driverdiameter= {{convert|5|ft|8|in|3|abbr=on}} |trailingdiameter= {{convert|3|ft|8|in|3|abbr=on}} |length= {{convert|41|ft|m|2|abbr=on}} |locoweight= {{convert|78.45|LT|t ST}} |fueltype= Coal |fuelcap= {{convert|4.0|LT|t ST}} |watercap= {{convert|2000|impgal|L USgal|abbr=on}} |boiler= GWR Number 2 |boilerpressure= {{convert|200|psi|kPa|abbr=on}} |firearea= {{convert|20.35|sqft|abbr=on}} |tubesandflues= {{convert|1144.94|sqft|abbr=on}} |fireboxarea= {{convert|121.8|sqft|abbr=on}} |superheaterarea= {{convert|82.2|sqft|abbr=on}} |cylindercount= Two |cylindersize= {{convert|18|x|30|in|mm|0|abbr=on}} |tractiveeffort= {{convert|24300|lbf|kN|abbr=on}} |operatorclass= GWR 5101 |powerclass= GWR D BR 4MT |axleloadclass= GWR Blue |withdrawndate= April 1956 – November 1965 |disposition=8 preserved, 1 used for spares, 1 rebuilt to freelance; remainder scrapped }} The GWR 5101 Class or Large Prairie was a class of 2-6-2T steam locomotives of the Great Western Railway. HistoryThe 5101 Class were medium-sized tank engines used for suburban and local passenger services all over the Great Western Railway system. The class was an updated version, by Collett, of Churchward's 1903 3100/5100 Class. The original 40 members of the 3100 class were renumbered 5100 and 5111 to 5149 in 1927. The first batches of 5101s filled in the numbers 5101 to 5110 and extended the class from 5150 to 5189. They were little changed from the Churchward locomotives as they then were, but had an increased axle loading of {{long ton|17|12}}; the maximum permitted for the ‘Blue’ route availability. Bunkers were of the standard Collett design with greater coal capacity. The 5100 number series was exhausted in 1934, and further new locomotives were numbered from 4100. The last 20 were built after nationalisation.[1]
As both freight and passenger traffic on branch lines declined post-World War II with increasing volumes of private motor cars, and replacement on urban services by diesel-powered rail cars, the bulk of the class found itself allocated to various mainline support duties, mainly banking and piloting, often on the South Devon Banks on the Exeter to Plymouth Line, or around the Severn Tunnel on the South Wales Main Line. A number of the class - 4110, 4115, 4121, 4144, 4150, 4156 and 4160 - ended their operational lives allocated to the major locomotive shed (88E) at {{Stnlnk|Severn Tunnel Junction}}, undertaking piloting and banking duties through both the Severn Tunnel and the associated goods yard.[2] Assistance was needed by all heavy trains through the Severn Tunnel, which entailed: {{convert|3.5|mile}} of 1-in-90 down to the middle of the tunnel; then a further {{convert|3.5|mile}} at 1-in-100 up to {{Stnlnk|Pilning}}; a short level then {{convert|3.5|mile}} more at 1-in-100 to {{Stnlnk|Patchway}}. However, the pilot locomotive usually came off at Pilning. Several of this group were sold for scrap to Woodham Brothers and consequently have survived into preservation. Accidents and incidents
WithdrawalThe below list shows when all of the original 5101's and later 4100's were withdrawn from service.
PreservationTen of the class avoiding scrapping in the 1960s (3 are original 5101's which includes 5193 which was rebuilt as a tender engine and the remaining 7 are the later 4100's). As of 2017, five have run in preservation, one is under active restoration, two are essentially in scrapyard condition and two have acted as donor locomotives for other projects: {{clear}}
ModelsGraham Farish manufacture a model of the Large Prairie in N scale. Hornby have manufactured a model of the class in 00 gauge in both Great Western and British railway liveries. Heljan are planning on producing a model of the large prairie in O gauge in 2017 [7]See also
References1. ^http://www.greatwestern.org.uk/m_in_262.htm 2. ^http://www.4150.org.uk/4150_history.html 3. ^{{cite journal |title=Light at the end of the tunnel for Severn 'Prairie' |journal=Steam Railway |publisher=Bauer Consumer Media Ltd |location=Peterborough |date=17 June 2016 |issue=455 |issn=0143-7232 |pages=40–42}} 4. ^{{Cite newspaper The Times |articlename=Four killed and 50 injured in train crash |day_of_week=Wednesday |date=1 December 1948 |page_number=4 |issue=51243 |column=A-B }} 5. ^http://www.railuk.info/steam/getsteam.php?row_id=1630 6. ^{{cite web| url=http://www.rail.co.uk/rail-news/2012/frames-ordered-for-new-gwr/| title=Frames Ordered for New GWR 47xx Class as Prairie Survivor is Dismantled| website=rail.co.uk| date=8 March 2012}} 7. ^http://www.hornbymagazine.com/2016/11/21/first-painted-o-gauge-prairie/ External links{{Commons category|GWR 5101 Class}}
5 : 2-6-2T locomotives|Great Western Railway locomotives|Railway locomotives introduced in 1929|Standard gauge steam locomotives of Great Britain|1′C1′ h2t locomotives |
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