DWWR 2

{{short description|Irish rail locomotive}}

{{Use Hiberno-English|date=March 2019}}

{{Use dmy dates|date=March 2019}}

{{Infobox locomotive

| name = DW&WR 2

| image = File:Rosslare - Ballygeary Harbour circa 1882 with DWWR 2-2-2WT No. 1 on the turntable.jpg

| alt =

| caption = No. 1 at Rosslare - Ballygeary Harbour, Rosslare, circa 1882.

| powertype = Steam

| designer = R. Cronin

| builder = Grand Canal Street

| ordernumber =

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| buildmodel =

| builddate = 1885–1896

| totalproduction =

| rebuilder =

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| numberrebuilt =

| whytetype = {{whyte|2-4-0|T}}

| uicclass =

| driver =

| gauge = {{track gauge|Irish}}

| leadingdiameter = {{convert|3|ft|8|in|mm|abbr=on}}

| driverdiameter = {{convert|5|ft|6|in|mm|abbr=on}}

| coupleddiameter =

| trailingdiameter =

| tenderdiameter =

| minimumcurve =

| wheelbase =

| engine total =

| leading =

| drivers =

| coupled =

| trailing =

| tender total =

| tendertruck =

| tenderbogie =

| pivotcentres =

| wheelspacing =

| length = {{convert|29|ft|8|in|mm|abbr=on}}

| over couplers =

| over bufferbeams=

| width =

| height =

| frametype =

| axleload = {{convert|14.5|LT|MT}}

| leadingbogie/pony=

| coupled all =

| coupled 1 =

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| coupled 5 =

| coupled 6 =

| coupled 7 =

| coupled 8 =

| trail bogie/pony=

| tenderbogieload =

| tenderaxle =

| weightondrivers =

| locoweight = {{convert|40|LT|MT}}

| tenderweight =

| locotenderweight =

| tendertype =

| fueltype =

| fuelcap =

| watercap = {{convert|800|impgal|abbr=on}}

| tendercap =

| sandcap =

| fireboxtype =

| firearea =

| boiler =

| boilertype =

| pitch =

| diameterinside =

| lengthinside =

| smalltubediameter=

| largetubediameter=

| boilerpressure = {{convert|150|lbf/in2|MPa|2|abbr=on}}

| safetyvalvetype =

| feedwaterheater =

| totalsurface =

| tubearea =

| archarea =

| fluearea =

| tubesandflues =

| fireboxarea =

| superheatertype =

| superheaterarea =

| cylindercount = 2

| cylindersize = {{convert|17|x|24|in|mm|0|abbr=on}}

| frontcylindersize=

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| valvegear =

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| valvetravel =

| valvelap =

| valvelead =

| transmission =

| trainheating =

| locobrakes =

| locobrakeforce =

| trainbrakes =

| safety =

| coupling =

| maxspeed =

| poweroutput =

| tractiveeffort = {{convert|12700|lbf|kN|2|abbr=on|lk=on}}

| factorofadhesion =

| operator = {{ubl|DW&WR|DSER|GSR|CIÉ}}

| operatorclass = G1 (Inchicore)

| powerclass = O/N T

| numinclass = 11

| fleetnumbers = {{ubl|1, 2, 6, 7, 9, 10, 28, 45–47, 49|423-425 (GSR/CIÉ)}}

| officialname =

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| axleloadclass =

| locale = Ireland

| deliverydate =

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| retiredate =

| withdrawndate = 1925-1955

| preservedunits =

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| currentowner =

| disposition = All scrapped

| notes = As re-built 1912

}}

The Dublin, Wicklow and Wexford Railway (DW&WR) 2, built in 1885, was the predecessor to a total of eleven {{whyte|2-4-0|T}} locomotives to emerge from Grand Canal Street railway works between 1885 and 1896.

Nos. 1, 6, 7 and 10, built between 1892 and 1896, had detail differences between them, Ahrons describes them as having a more modern appearance.{{rp|48}}

Locomotive No. 10 (St. Seneanus) was rebuilt as 2-4-2T in 1903. Nos. 28 (St. Lawrence), 45 (St. Kieran), and 46 (Princess Mary) were also rebuilt later in 1909/10.

On review following amalgamation into Great Southern Railways (GSR) in 1925, Nos. 1, 2 and 6 were promptly withdrawn despite No. 2 having received a new boiler in 1914. The remaining four engines Nos. 7, 9, 47 and 49 were designated GSR class 423/G1 and allocated the numbers 426, 424, 425 and 423 respectively. Unlike the other survivors, No. 426 had not been re-boilered in 1914–1916 and it was withdrawn in 1926.