LNWR Dock Tank

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

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

{{Infobox locomotive

| name = LNWR 317 class
4′ 3″ Saddle Tank Shunter

| image = LNWR engine No.3464, 317 Class.jpg

| alt =

| caption = Locomotive 317, Crewe Works No.3464

| powertype = Steam

| designer =

| builder = Crewe Works

| ordernumber =

| serialnumber = 3741, 3946, 3977–3984, 4175–4184

| buildmodel =

| builddate = 1896–1901

| totalproduction = 20

| whytetype = 0-4-2ST

| uicclass = B1′ n2t

| gauge = {{RailGauge|ussg}}

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

| trailingdiameter = {{convert|2|ft|6|in|m|3|abbr=on}}

| minimumcurve =

| wheelbase = {{ubl|Coupled: {{convert|7|ft|3|in|m|2|abbr=on}}|Loco: {{convert|15|ft|6|in|m|2|abbr=on}}}}

| length =

| width =

| height =

| axleload =

| weightondrivers =

| locoweight = {{long ton|34|17}}

| fueltype = Coal

| fuelcap = {{Convert|1.5|LT}}

| watercap = {{convert|620|impgal|abbr=on}}

| sandcap =

| boiler =

| boilerpressure = {{convert|150|lbf/in2|MPa|2|abbr=on}}

| feedwaterheater =

| firearea = {{convert|15|sqft|m2|abbr=on}}

| tubearea =

| fireboxarea =

| totalsurface = {{convert|967|sqft|m2|abbr=on}}

| cylindercount = Two, inside

| cylindersize = {{convert|17|x|24|in|mm|0|abbr=on}}

| valvegear =

| valvetype =

| valvetravel =

| valvelap =

| valvelead =

| transmission =

| maxspeed =

| poweroutput =

| tractiveeffort =

| factorofadhesion =

| trainheating =

| locobrakes =

| locobrakeforce =

| trainbrakes =

| safety =

| operator = {{ubl|London and North Western Railway|London, Midland and Scottish Railway|British Railways}}

| operatorclass =

| powerclass = LMS: 1P, later 0F

| numinclass = {{ubl|1 January 1923: 20|1 January 1948: 2}}

| fleetnumbers =

| officialname =

| nicknames = Bissel tanks

| axleloadclass =

| locale = London Midland Region

| deliverydate =

| firstrundate =

| lastrundate =

| withdrawndate = 1927–1938, 1953, 1956

| scrapdate =

| disposition = All scrapped

| notes =

}}

The LNWR 317 class, (also known as Saddle Tank Shunter, Dock Tank or Bissel Tank) consisted of a class of 20 square saddle-tanked steam locomotives built by the London and North Western Railway at their Crewe Works between 1896 and 1901. They had a very short coupled wheelbase, with a trailing Bissel truck to carry weight.