GWR 9400 Class

{{Short description|British steam locomotive class (1947–1965)}}

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

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

{{more footnotes|date=December 2014}}

{{Infobox locomotive

| name = Great Western Railway 9400 class

| powertype = Steam

| image = File:Paddington Hawksworth '9400' 0-6-0PT geograph-2954481-by-Ben-Brooksbank.jpg

| caption = 9405 at Paddington in 1947

| designer = Frederick Hawksworth

| builder = {{ubl|Swindon Works (10)|R. Stephenson & Hawthorns (100)|W. G. Bagnall (50)|Yorkshire Engine Company (50)}}

| ordernumber = GWR Lot Nos. 365, 382–387

| serialnumber = {{ubl|RSH: 7450–69, 7547–96, 7611–40|WGB: 2910–2959|YEC: 2443–72, 2544–53, 2575–84}}

| builddate = 1947–1956

| totalproduction = 210

| whytetype = 0-6-0PT

| uicclass = {{ubl|C h2t (10)|C n2t (200)}}

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

| driverdiameter = {{convert|4|ft|7+1/2|in|m|3|abbr=on}}

| minimumcurve = {{ubl|{{convert|5|chain}} normal,|{{convert|4.5|chain}} slow}}

| wheelbase = {{convert|15|ft|6|in|m|2|abbr=on}}

| length = {{convert|33|ft|2|in|m|2|abbr=on}} over buffers

| width = {{convert|8|ft|7|in|m|3|abbr=on}}

| height = {{convert|12|ft|5+1/2|in|m|3|abbr=on}}

| axleload = {{long ton|19|5}} ({{convert|19|LT|5|Lcwt|ST|1|abbr=on|disp=output only}}) full

| locoweight = {{long ton|55|7}} ({{convert|55|LT|7|Lcwt|ST|1|abbr=on|disp=output only}}) full

| fueltype = Coal

| fuelcap =

| watercap = {{convert|1300|impgal|abbr=on}}

| firearea = {{convert|17.40|sqft|m2|abbr=on}}

| boiler = GWR Standard No. 10{{Cite book|last=Champ|first=Jim |title=An Introduction to Great Western Locomotive Development |year=2018|publisher=Pen & Sword Transport |isbn=978-1-4738-7784-9|location=Barnsley |oclc=1029234106 |ol=26953051M |page=320 }}

| fireboxarea = {{convert|101.7|sqft|m2|abbr=on}}

| tubearea = {{convert|1245.7|sqft|m2|abbr=on}}

| totalsurface = {{convert|1347|sqft|m2|abbr=on}}

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

| cylindercount = Two, inside

| cylindersize = {{convert|17+1/2|x|24|in|mm|0|abbr=on}}

| tractiveeffort = {{convert|22515|lbf|kN|2|abbr=on}}

| operator = {{ubl|Great Western Railway|British Railways}}

| operatorclass = 9400 or 94XX

| powerclass = {{ubl|GWR: C|BR: 4F}}

| axleloadclass = GWR: Red

| fleetnumbers = 9400–9499, 8400–8499, 3400–3409

| locale = Western Region

| withdrawndate = 1959–1965

| preservedunits = 9400, 9466

| disposition = Two preserved, remainder scrapped

}}

The Great Western Railway (GWR) 9400 Class is a class of 0-6-0 pannier tank steam locomotive, used for shunting and banking duties.

The first ten 9400s were the last steam engines built by the GWR. After nationalisation in 1948, another 200 were built by private contractors for British Railways (BR). Most had very short working lives as the duties for which they were designed disappeared through changes in working practices or were taken over by diesel locomotives. Two locomotives survived into preservation, with the oldest of the class, 9400 as part of the National Collection.