| 词条 | LSWR G14 class | |||||||||
| 释义 |
|powertype=Steam |name = LSWR/SR G14 class[1]{{page needed|date=October 2016}} |image = |caption = |designer = Dugald Drummond |builder = LSWR Nine Elms Works |builddate = 1908 |totalproduction = 5 |whytetype = 4-6-0 |uicclass = 2'Cn |gauge = {{track gauge|ussg}} |leadingdiameter = {{convert|3|ft|7|in|m|3|abbr=on}} |driverdiameter = {{convert|6|ft|0|in|m|3|abbr=on}} |length = |locoweight = {{convert|70.95|LT|t|1}} |tenderweight = {{convert|49.00|LT|t|1}} |fueltype = Coal |fuelcap = {{convert|4|LT|t|1}} |watercap = {{convert|4500|impgal|l|abbr=on}} |cylindercount = Four |cylindersize = 15×26 in (381×660 mm) |boilerpressure = {{convert|200|psi|MPa|2|abbr=on|lk=on}} |firearea = {{convert|31.5|sqft|m2|abbr=on}} |tractiveeffort = {{convert|24192|lbf|kN|2|abbr=on|lk=on}} |operator=London and South Western Railway, Southern Railway |locale=Great Britain |retiredate=1925 |fleetnumbers=453–457 |disposition = All "rebuilt" to N15 class }} The LSWR G14 class was a class of 4-6-0 locomotive designed by Dugald Drummond for the London and South Western Railway. BackgroundThe continuing need to grasp the nettle in terms of Drummond's first two 4-6-0 classes meant that he went back to the drawing board to create yet another design. The LSWR's immediate traffic needs could not be covered by the relatively unsuccessful E14 class design of 1907 and the first Drummond 4-6-0, the F13 class of 1905 had been withdrawn from the heavy passenger services they were designed to undertake, as they would not 'run' and were heavy on coal, water and man-hours in terms of upkeep.[1]{{page needed|date=October 2016}} However, the problem of continually accelerating timetables to the South Coast ports remained, and any further engines of the E14 class could not be relied upon to uphold the heavy passenger services alone.[1]{{page needed|date=October 2016}} It was once again clear that another 4-6-0 design was needed due to bolster the strength of heavy express passenger locomotives available to the LSWR's operating department.[1]{{page needed|date=October 2016}} Their proven ability to ply their trade at faster speeds, and their inherently better power-to-weight ratio on other lines meant that Drummond decided to persevere with the concept.[1]{{page needed|date=October 2016}} He also retained the four-cylinder layout. The resultant design was to become the G14 Class.[1]{{page needed|date=October 2016}} Construction historyDrummond decided to continue his development of the 4-6-0 wheel arrangement in anticipation of further increases in speed and length of trains, a concept that had many advantages that would be incorporated onto his third design of this type. A 175 lbf/in² saturated boiler, somewhat smaller than on the F13/E14 classes was utilised to power the four-cylinder front end.[1]{{page needed|date=October 2016}} The new design was equipped with inside and outside sets of Walschaerts valve gear, therefore reducing the mechanical complexity that had plagued his previous designs, and these powered 6' wheels.[2] This factor also meant a slightly lighter axle-loading, compared to the mixed Stephenson/Walschaerts F13 class. Large, single splashers were also implemented which covered the wheels, though these would prove troublesome in service. The Drummond 'watercart' eight-wheeled tender was utilised for the long journeys on the LSWR mainline. Full-scale construction was undertaken at Nine Elms, with the first of five G14s being outshopped in 1908.
Rebuilding under MaunsellAfter a period of 17 years in both primary and secondary passenger duties, Richard Maunsell, who became Chief Mechanical Engineer of the newly formed Southern Railway in 1923, decided that as the class did not to conform with the general standardization of Southern locomotive classes it should be withdrawn.[1]{{page needed|date=October 2016}} The G14s were reduced to kits of parts, some of which may have been utilised in creating a further batch of N15 (King Arthur Class) locomotives.[3]{{page needed|date=October 2016}} Livery and numberingUnder the LSWR, the G14s were outshopped in the LSWR Passenger Royal Green livery with purple-brown edging, creating panels of green.[1]{{page needed|date=October 2016}} This was further lined in white and black with 'LSWR' in gilt on the tender tank sides. When transferred to Southern Railway ownership after 1923, the locomotives were outshopped in Richard Maunsell's darker version of the LSWR livery.[4]{{page needed|date=October 2016}} The LSWR standard gilt lettering was changed to yellow with 'Southern' on the water tank sides. The locomotives also featured black and white lining.[5]{{page needed|date=October 2016}} Operational detailsThe G14 design had originally been intended to operate expresses between Salisbury and Exeter, and were considered to be more successful than their F13 and E14 predecessors.[1]{{page needed|date=October 2016}} However, the class still had most of the drawbacks associated with Drummond 4-6-0s in terms of high water and coal consumption.[1]{{page needed|date=October 2016}} The G14s continued in their Drummond guise without modification until they were withdrawn in 1925 by Richard Maunsell, who put their watercart tenders and numbers to use in new N15 class locomotives.[1]{{page needed|date=October 2016}} As a result, no examples survived into preservation. References1. ^1 2 3 4 5 6 7 8 9 10 11 Bradley (1986) {{refbegin}}2. ^Swift, Peter W. Railway Archive 6: pp. 3–24. 3. ^Haresnape (1977) 4. ^Swift, Peter (2006). Maunsell 4-6-0 King Arthur Class. 5. ^Haresnape & Rowledge (1982).
4 : London and South Western Railway locomotives|4-6-0 locomotives|Railway locomotives introduced in 1908|Standard gauge steam locomotives of Great Britain |
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