Midland Railway 990 Class

{{Use dmy dates|date=February 2018}}

{{Use British English|date=February 2018}}

{{Infobox locomotive

|name = Midland Railway 990 class

|image = 990 official photo.jpg

|caption = The official photograph of 990 in photographic grey livery

|powertype = Steam

|designer = Richard Deeley

|builder = Derby Works

|builddate = 1907–1909

|totalproduction = 10

|whytetype = 4-4-0

|uicclass = 2′B n2, later 2′B h2

|gauge = {{Track gauge|ussg|allk=on}}

|leadingdiameter= {{convert|3|ft|3+1/2|in|m|3|abbr=on}}

|driverdiameter = {{convert|6|ft|6+1/2|in|m|3|abbr=on}}

|length =

|locoweight = {{long ton|58|5}}

|fueltype = Coal

|fuelcap =

|watercap =

|boiler = MR type G9A, later G9AS

|firearea =

|boilerpressure = {{convert|200|lbf/in2|MPa|2|abbr=on}}

|cylindercount = Two, inside

|cylindersize = {{convert|20+1/2|x|26|in|mm|0|abbr=on}}

|valvegear = Deeley

|tractiveeffort = {{convert|23662|lbf|kN|1|abbr=on}}

|operator = {{ubl|Midland Railway|London, Midland and Scottish Railway}}

|operatorclass = MR: 990

|powerclass = 4P

|withdrawndate = 1925–1929

|fleetnumbers = 990–999 (801–809 from 1926)

|disposition = All scrapped

}}

The Midland Railway 990 class was a class of 4-4-0 steam locomotive with simple expansion. Ten were built by the Midland Railway in 1907–1909. They shared many features with the 1000 class compounds. Initially built as saturated, from 1910 to 1914 they were equipped with superheated boilers. These locomotives were notable for their work north of Leeds, over the difficult Settle and Carlisle route.