SR Lord Nelson Class 850 Lord Nelson

{{Use dmy dates|date=April 2022}}

{{DISPLAYTITLE:SR Lord Nelson Class 850 Lord Nelson}}

{{Infobox locomotive

|name = 850 Lord Nelson

|image = Hugh llewelyn 850 (5609857690).jpg

|caption = 850 Lord Nelson seen in preservation, in May 2007

|powertype = Steam

|builder = Eastleigh Works

|builddate = 1926

|whytetype = 4-6-0

|uicclass = 2′C h4

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

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

|driverdiameter = {{convert|6|ft|7|in|m|3|abbr=on}}

|length = {{convert|69|ft|9+3/4|in|m|sigfig=3|abbr=on}}

|locoweight = {{long ton|83|10|}}

|tenderweight = {{long ton|57|19|}}

|fueltype = Coal

|fuelcap = {{long ton|5|0|lk=on}} ({{convert|5.1|t|ST|disp=output only}})

|watercap = {{convert|5000|impgal|abbr=on}}

|boilerpressure = {{convert|220|lbf/in2|MPa|2|abbr=on}}

|firearea = {{convert|33|ft2|m2|abbr=on}}

|totalsurface =

|superheaterarea =

|tractiveeffort = {{convert|33510|lbf|kN|2|abbr=on}}

|cylindercount = Four

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

|locale = Great Britain

|powerclass = BR: 7P

|designer = Richard Maunsell

|operator = {{ubl|Southern Railway →|British Railways (Southern Region)}}

|operatorclass = Lord Nelson class

|fleetnumbers = 850

|officialname = Lord Nelson

|lastrundate =

|withdrawndate = August 1962

|restoredate =

|disposition = Out of service, awaiting an overhaul

|website = {{Official URL}}

}}

File:SR Lord Nelson 850, with indicator shelter (CJ Allen, Steel Highway, 1928).jpg for prototype testing, {{c.|1926–1927}}]]

Southern Railway (SR) No. 850 Lord Nelson (originally E850, BR no. 30850) is a preserved British steam locomotive of the Lord Nelson class. It forms part of the United Kingdom's National Railway Collection.