SEK class Λα

{{short description|Class of 1920s steam locomotives}}

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

{{one source|date=December 2014}}

{{Infobox locomotive

| name = SEK Class Λα

| image =

| alt =

| caption =

| powertype = Steam

| designer =

| builder = {{ubl|Lokomotivfabrik der StEG (10)|Škoda Works (30)}}

| ordernumber =

| serialnumber =

| buildmodel =

| builddate = 1926 (10), 1927 (30)

| totalproduction = 40

| rebuilder =

| rebuilddate =

| numberrebuilt =

| whytetype = 2-10-0

| uicclass = 1′E h2

| driver =

| gauge = {{track gauge|sg}}

| leadingdiameter =

| driverdiameter = {{convert|1450|mm|ftin|frac=8|abbr=on}}

| tenderdiameter =

| minimumcurve =

| wheelbase =

| engine total =

| leading =

| drivers =

| coupled =

| trailing =

| tender total =

| tendertruck =

| tenderbogie =

| pivotcentres =

| wheelspacing =

| length =

| over couplers =

| over bufferbeams= {{convert|19.716|m|abbr=on}}

| width =

| height =

| frametype =

| axleload =

| leadingbogie/pony=

| coupled all =

| coupled 1 =

| coupled 2 =

| coupled 3 =

| coupled 4 =

| coupled 5 =

| coupled 6 =

| coupled 7 =

| coupled 8 =

| trail bogie/pony=

| tenderbogieload =

| tenderaxle =

| weightondrivers = {{convert|72.2|t}}

| locoweight = {{convert|85.4|t}}

| tenderweight =

| locotenderweight =

| tendertype =

| fueltype =

| fuelcap =

| watercap =

| tendercap =

| sandcap =

| fireboxtype =

| firearea = {{convert|4.47|m2|abbr=on}}

| boiler =

| boilertype =

| pitch =

| diameterinside =

| lengthinside =

| smalltubediameter=

| largetubediameter=

| boilerpressure = {{convert|14|kg/cm2|MPa psi|sigfig=3|abbr=on}}

| safetyvalvetype =

| feedwaterheater =

| totalsurface = {{convert|211.0|m2|abbr=on}}

| tubearea =

| archarea =

| fluearea =

| tubesandflues =

| fireboxarea =

| superheatertype = {{convert|58.3|m2|abbr=on}}

| superheaterarea =

| cylindercount = Two, outside

| cylindersize = {{convert|610|x|720|mm|in|frac=16|abbr=on}}

| valvegear =

| valvetype =

| valvetravel =

| valvelap =

| valvelead =

| transmission =

| trainheating =

| locobrakes =

| locobrakeforce =

| trainbrakes =

| safety =

| coupling =

| maxspeed =

| poweroutput =

| tractiveeffort =

| factorofadhesion =

| operator = SEK

| operatorclass =

| powerclass =

| numinclass =

| fleetnumbers = 901–940

| officialname =

| nicknames =

| axleloadclass =

| locale =

| deliverydate =

| firstrundate =

| lastrundate =

| retiredate =

| withdrawndate =

| preservedunits =

| restoredate =

| scrapdate =

| currentowner =

| disposition =

| notes =

}}

SEK (Sidirodromoi Ellinikou Kratous, Hellenic State Railways) Class Λα (or Class La; Lambda-alpha) is a class of forty 2-10-0 steam locomotives purchased in 1926 and 1927 from Lokomotivfabrik der StEG and Škoda Works

They were given the class letters "Λα" and numbers 901 to 940.