NER Class D

{{about|the 4-4-4T class|the 2-4-0 class|NER Class F}}

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

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

{{Infobox Locomotive

|powertype = Steam

|name = {{Ubl | NER Class D | LNER Class H1}}

|image = Image from page 447 of "Railway mechanical engineer" (1916).jpg

|caption =

|designer = Vincent Raven

|builder = NER Darlington

|builddate = 1913, 1920—1922

|totalproduction = 45

|whytetype = 4-4-4T

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

|leadingdiameter = {{convert|3|ft|1+1/4|in|3|abbr=on}}

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

|trailingdiameter = {{convert|3|ft|1+1/4|in|3|abbr=on}}

|wheelbase = {{convert|34|ft|6|in|abbr=on}}

|locoweight = {{convert|87.35|LT|t ST|abbr=on}}

|fueltype = Coal

|fuelcap = {{convert|4|LT|t ST|abbr=on}}

|watercap = {{convert|2000|impgal|abbr=on}}

|cylindercount = three

|cylindersize = {{convert|16+1/2|x|26|in|0|abbr=on}}

|firearea = {{convert|23|sqft|abbr=on}}

|boilerpressure = {{convert|160|psi|MPa|abbr=on}}

|tubearea = {{convert|654.24|sqft|abbr=on}}

|fireboxarea = {{convert|124|sqft|abbr=on}}

|totalsurface = {{convert|1252.974|sqft|abbr=on}}

|fluearea = {{convert|280.6|sqft|abbr=on}}

|superheaterarea = {{convert|194.13|sqft|abbr=on}}

|superheatertype = Schmidt

|tractiveeffort = {{convert|22940|lbf|kN|abbr=on}}

|operatorclass =

|valvegear = Stephenson

|operator = North Eastern Railway, London and North Eastern Railway

|retiredate = 1931-1936

|disposition = All rebuilt to LNER Class A8

}}

The North Eastern Railway Class D (later London and North Eastern Railway (LNER) Class H1) was a class of 4-4-4T three-cylinder side tank steam locomotive designed by Vincent Raven in 1913.{{Cite book

|last=Ahrons |first=E. L.

|author-link=E.L. Ahrons

|title=The British Steam Railway Locomotive 1825-1925

|year=1927

|publisher=Locomotive Publishing Co. |location=Amen Corner, London

|ref=Ahrons, British Steam Railway Locomotive

|pages=338

}} They were used for rural passenger services. Forty five were built in total; a first batch of twenty, then a further twenty five after the War.{{Cite web

|title=NER Raven H1 4-4-4T Locomotives

|url=http://www.lner.info/locos/H/h1.shtml

|publisher=LNER Encyclopedia

}}

Between 1931 and 1936, all of the LNER H1 class were rebuilt with a 4-6-2T wheel layout and re-classified as A8.{{Cite book

|title=Locomotives of British Railways

|first1=H.C. |last1=Casserley

|author-link=H. C. Casserley

|first2=L.L. |last2=Asher

|publisher=Spring Books

|year=1961

|orig-year=1955

|ref=Casserley & Asher, Locomotives of British Railways

|pages=113, 472

}} They were scrapped between 1957 and 1960.