NER Class S1

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

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

{{one source|date=December 2016}}

{{Infobox Locomotive

| name = NER Class S1
LNER Class B14

| image = North Eastern Railway Worsdell S1 class 4-6-0 locomotive 2111 (Howden, Boys' Book of Locomotives, 1907).jpg

| caption =

| powertype = Steam

| designer = Wilson Worsdell

| builddate = 1900-1901

| rebuilddate =

| builder =

| totalproduction = 5

| whytetype = 4-6-0

| leadingdiameter = {{convert|3|ft|7+1/4|in|abbr=on}}

| driverdiameter = {{convert|6|ft|8+1/4|in|abbr=on}}

| wheelbase = {{convert|27|ft|6|in|abbr=on}} engine
{{convert|12|ft|8|in|abbr=on}} tender
{{convert|51|ft|6+3/4|in|abbr=on}} total

| locoweight = {{convert|67.1|LT|abbr=on}}

| tenderweight = {{convert|41.1|LT|abbr=on}}

| locotenderweight = {{convert|108.2|LT|abbr=on}}

| axleload = {{convert|19.5|LT|abbr=on}}

| totalsurface = {{convert|1750|sqft|abbr=on}}

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

| fireboxarea = {{convert|120|sqft|abbr=on}}

| tubearea = {{convert|935|sqft|abbr=on}}

| superheaterarea = {{convert|294|sqft|abbr=on}}

| fluearea = {{convert|401|sqft|abbr=on}}

| boiler = {{convert|4|ft|9|in|abbr=on}}

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

| cylindercount = 2 (outside)

| cylindersize = {{convert|20|x|26|in|abbr=on}}

| tractiveeffort = {{convert|19310|lbf|kN|abbr=on}}

| valvegear = Stephenson

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

| fleetnumbers = 2111-2115

| withdrawndate = 1929-1931

| disposition = All scrapped

}}

The NER Class S1 (LNER Class B14) was a class of 4-6-0 steam locomotives of the North Eastern Railway. It was designed by Wilson Worsdell and five locomotives were built between 1900 and 1901 at Gateshead works. The S1 was similar to the NER Class S but had larger driving wheels and a higher boiler pressure.{{cite web| url=http://www.lner.info/locos/B/b14.shtml| title=The Worsdell Class B14 (NER Class S1) 4-6-0s| website=LNER Encyclopedia}}