GNRI Class U

{{Short description|Class of two-cylinder 4-4-0 locomotives}}

{{Use dmy dates|date=April 2017}}

{{Use British English|date=April 2017}}

{{Infobox locomotive

|name = Great Northern Railway (Ireland) class U

|powertype = Steam

|image = Omagh Station - geograph.org.uk - 332912.jpg

|caption = 204 Antrim on a passenger train leaving Omagh, 7 June 1957

|designer = George T. Glover

|builder = Beyer, Peacock & Co.

|ordernumber =

|serialnumber = 5904-8, 7244-8

|buildmodel =

|builddate = 1915 (5), 1947 (5)

|totalproduction = 10

|rebuilder =

|rebuilddate =

|numberrebuilt =

|whytetype = 4-4-0

|uicclass = 2′B h2

|gauge = {{RailGauge|5ft3in}}

|leadingdiameter =

|driverdiameter = {{convert|5|ft|9|in|m|3|abbr=on}}

|minimumcurve =

|wheelbase =

|length =

|width =

|height =

|axleload =

|weightondrivers =

|locoweight =

|tenderweight =

|locotenderweight =

|tendertype =

|fueltype = coal

|fuelcap =

|watercap =

|tendercap =

|sandcap =

|boiler =

|boilerpressure = {{convert|175|psi|MPa|2|abbr=on}}

|feedwaterheater =

|firearea =

|tubearea =

|fluearea =

|tubesandflues =

|fireboxarea =

|totalsurface =

|superheatertype =

|superheaterarea =

|cylindercount = Two, inside

|cylindersize = {{convert|18|x|24|in|mm|0|abbr=on}}

|valvegear =

|valvetype =

|valvetravel =

|valvelap =

|valvelead =

|transmission =

|maxspeed =

|poweroutput =

|tractiveeffort = {{convert|16763|lbf|kN|1|abbr=on}}

|factorofadhesion =

|trainheating =

|locobrakes =

|locobrakeforce =

|trainbrakes =

|safety =

|operator = GNR(I)
UTA
CIÉ

|operatorclass = U

|powerclass =

|numinclass =

|fleetnumbers = 196–205

|officialname =

|nicknames =

|axleloadclass =

|locale =

|deliverydate = 1915, 1948

|firstrundate = 1915

|lastrundate = 1965

|withdrawndate = 1959–1965

|preservedunits =

|restoredate =

|scrapdate = 1959, 1961-1965

|currentowner =

|disposition = All scrapped

}}

The GNR(I) class U was a class of 4-4-0 steam locomotives built for the Great Northern Railway (Ireland).