GWR 5400 Class

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

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

{{Infobox locomotive

| powertype = Steam

| name = GWR 5400 Class

| image = Old Oak Common Locomotive Depot auto-fitted 0-6-0 Pannier tank geograph-2951270-by-Ben-Brooksbank.jpg

| caption = 5405 at Old Oak Common TMD in 1947

| designer = Charles Collett

| builder = GWR Swindon Works

| builddate = 1930–1932, 1935{{sfnb|le Fleming|1958|p=E83}}

| totalproduction = 25{{sfnb|le Fleming|1958|p=E83}}

| ordernumber= Lots 277 (part), 301

| whytetype = 0-6-0PT

| gauge = {{track gauge|56.5in|allk=on}}

| driverdiameter = {{convert|5|ft|2|in|3|abbr=on}}{{sfnb|le Fleming|1958|p=E83}}

| wheelbase = {{convert|14|ft|8|in|m|2|abbr=on}}{{sfnb|le Fleming|1958|p=E84}}

| minimumcurve = {{plainlist|

• {{convert|4|chain|0}} normal
• {{convert|3.5|chain|0}} slow{{sfnb|le Fleming|1958|p=E77}}

}}

| length = Over buffers: {{convert|31|ft|1|in|abbr=on}}{{sfnb|Whitehurst|1973|p=156}}

| width = {{convert|8|ft|7|in|3|abbr=on}}{{sfnb|Whitehurst|1973|p=156}}

| height = {{convert|12|ft|6+3/16|in|abbr=on}}{{sfnb|Whitehurst|1973|p=156}}

| frametype = {{plainlist|

• Type: Inside
• Length: {{convert|26|ft|5|in|abbr=on}}{{sfnb|Whitehurst|1973|p=156}}

}}

| locoweight = {{long ton|46|12}}
({{convert|46|LT|12|Lcwt|ST|1|abbr=on|disp=output only}}) full{{sfnb|le Fleming|1958|p=E84}}

| axleload = {{long ton|15|12}}
({{convert|15|LT|12|Lcwt|ST|1|abbr=on|disp=output only}}){{sfnb|le Fleming|1958|p=E84}}

| fueltype = Coal

| fuelcap = {{long ton|3|4}}
({{convert|3|LT|4|Lcwt|ST|1|abbr=on|disp=output only}}){{sfnb|le Fleming|1958|p=E84}}

| watercap = {{convert|1100|impgal|abbr=on}}{{sfnb|le Fleming|1958|p=E84}}

| cylindercount = two inside

| cylindersize = {{convert|16+1/2|x|24|in|0|abbr=on}}{{sfnb|le Fleming|1958|p=E84}}

| firearea = {{convert|16.76|sqft|m2|abbr=on}}{{sfnb|le Fleming|1958|p=E84}}

| tubearea = {{convert|1004.2|sqft|m2|abbr=on}}{{sfnb|le Fleming|1958|p=E84}}

| fireboxarea = {{convert|81.8|sqft|m2|abbr=on}}{{sfnb|le Fleming|1958|p=E84}}

| totalsurface = {{convert|1086.0|sqft|m2|abbr=on}}{{sfnb|le Fleming|1958|p=E84}}

| boiler = GWR Standard No. 21{{sfnb|Champ|2018|p=319}}

| pitch = {{Convert|7|ft|0|in|abbr=on}}{{sfnb|le Fleming|1958|p=E84}}

| diameterinside = Outside diameter: {{Convert|4|ft|3|in|abbr=on}} & {{Convert|4|ft|2+1/8|in|abbr=on}}

| lengthinside = Barrel: {{Convert|10|ft|6|in|abbr=on}}

| boilerpressure = {{convert|165|psi|MPa|abbr=on}}{{sfnb|le Fleming|1958|p=E83}}

| tractiveeffort = {{convert|14780|lbf|kN|abbr=on}}{{sfnb|le Fleming|1958|p=E84}}

| locobrakes = steam

| trainbrakes = vacuum

| trainheating = Steam from locomotive boiler

| safety = ATC{{sfnb|le Fleming|1958|p=E84}}

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

| fleetnumbers = 5400–5424{{sfnb|le Fleming|1958|p=E84}}

| powerclass = {{plainlist|

• GWR: Ungrouped
• BR: 1P{{sfnb|le Fleming|1958|p=E84}}

}}

| locale = Western Region

| withdrawndate = 1956–1963{{sfnb|Whitehurst|1973|p=49}}

| axleloadclass = GWR: Yellow{{sfnb|le Fleming|1958|p=E84}}

| disposition = All scrapped

}}

The Great Western Railway (GWR) 5400 Class was a class of 0-6-0 pannier tank steam locomotive. They were similar in appearance to many other GWR tank engines but smaller than the ubiquitous GWR 5700 Class.

The nominally Collett-designed 5400 Class had {{convert|5|ft|2|in|3|abbr=on}} driving wheels for greater top speed with autocoaches, and were all fitted with the required remote control gear for working the push-pull autotrains. They had a modern cab and a larger bunker. They were frequently seen on inner suburban routes from Paddington.