| 词条 | MGWR Class 9 | ||||||||||||||||||||
| 释义 |
| name = MGWR Class 9 | image = | alt = | caption = | powertype = Steam | designer = | builder = Grendon | ordernumber = | serialnumber = | buildmodel = | builddate = 1855-1856 | totalproduction = | rebuilder = | rebuilddate = | numberrebuilt = | whytetype = 0-6-0 | uicclass = | driver = | gauge = {{track gauge|Irish}} | leadingdiameter = | driverdiameter = {{convert|45|ft|1|in|mm|abbr=on}} | coupleddiameter = | trailingdiameter = | tenderdiameter = | minimumcurve = | wheelbase = | engine total = | leading = | drivers = | coupled = | trailing = | tender total = | tendertruck = | tenderbogie = | pivotcentres = | wheelspacing = | length = | over couplers = | over bufferbeams= | width = | height = | frametype = | axleload = | leadingbogie/pony= | coupled all = | coupled 1 = | coupled 2 = | coupled 3 = | coupled 4 = | coupled 5 = | coupled 6 = | coupled 7 = | coupled 8 = | trail bogie/pony= | tenderbogieload = | tenderaxle = | weightondrivers = | locoweight = 20 tons | tenderweight = | locotenderweight = | tendertype = | fueltype = | fuelcap = | watercap = | tendercap = | sandcap = | fireboxtype = | firearea = | boiler = | boilertype = | pitch = | diameterinside = | lengthinside = | smalltubediameter= | largetubediameter= | boilerpressure = | safetyvalvetype = | feedwaterheater = | totalsurface = | tubearea = | archarea = | fluearea = | tubesandflues = | fireboxarea = | superheatertype = | superheaterarea = | cylindercount = | cylindersize = | frontcylindersize= | rearcylindersize = | hpcylindersize = | lpcylindersize = | valvegear = | valvetype = | valvetravel = | valvelap = | valvelead = | transmission = | trainheating = | locobrakes = | locobrakeforce = | trainbrakes = | safety = | coupling = | maxspeed = | poweroutput = | tractiveeffort = | factorofadhesion = | operator = Midland Great Western Railway (MGWR) | operatorclass = | powerclass = | numinclass = 4 (MGWR) | fleetnumbers = 36-39 | officialname = | nicknames = | axleloadclass = | locale = Ireland | deliverydate = 1855-1856 | firstrundate = | lastrundate = | retiredate = | withdrawndate = 1881 | preservedunits = | restoredate = | scrapdate = | currentowner = | disposition = | notes = }} The Midland Great Western Railway (MGWR) Class 9 consisted of four engines built by Thomas Grendon and Company of Drogheda in the period 1855-1856.[1]
The MGWR Class 9 was the first 0-6-0 type on the MGWR. It has {{convert|5|ft|1|in}} driving wheels. They were ordered by Edward Wilson during his short tenure as Locomotive Superintendent from 1853. It is speculated Wilson had little to do with the design, especially as Robert Stephenson and Company had subcontracted an 0-6-0 build to Grendons at this time. [1] The 0-6-0 three driving axle design has 6 driving wheels against the rail as opposed to the 2-4-0 or 4-2-0 which have two axles and 4 driving wheels. If other factors are equal will have better adhesion and less propensity to slip and should be able to haul a heavier train, for example the MGWR Class 9 had demonstrated the capability to pull 600 tons at {{convert|20|mph|kph}}. The difficulty lies in a coupling rod over more than 2 axles is more complex to allow for vertical motion. The next two Locomotive Superintendents, Joseph Cabry and Robert Ramage, remained with the 2-4-0, 4-2-0 and even 2-2-2 one or two driving axles designs. It was not until Martin Atock became Locomotive Superintendent in 1872 that further 0-6-0 locomotives were ordered with MGWR Class L four years later.[1][2] Grendons supplied two similar engines to the Dundalk and Enniskillen Railway at about the same time.[1] References1. ^1 2 3 {{cite book| title=The Midland Great Western Railway of Ireland – An illustrated History|last=Shepherd|first=Ernie|publisher=Midland Publishing Limited|year=1994|ISBN=1-85780-008-7|pages=83,123,131,138}} {{Ireland Steam Locomotives}}2. ^{{cite book| title=The Midland Great Western Railway of Ireland – An illustrated History|last=Shepherd|first=Ernie|publisher=Midland Publishing Limited|year=1994|ISBN=1-85780-008-7|pages=86,130}} 6 : 0-6-0 locomotives|5 ft 3 in gauge locomotives|Railway locomotives introduced in 1855|Midland Great Western Railway locomotives|Thomas Grendon and Company locomotives|Scrapped locomotives |
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