Russian locomotive class A

{{short description|Russian steam locomotives}}

{{Expand language|topic=|langcode=ru|otherarticle=А (паровоз)|date=March 2023}}

{{One source|date=July 2024}}

{{Infobox locomotive

| name = Russian locomotive class A

| bgcolor =

| color =

| image = File:Parovoz Kompaund s paroperegri︠e︡vatelem Shmidta 20458v (cropped).jpg

| alt =

| caption = Ab 132, which had been converted to a class B in 1912.

| powertype = Steam

| designer =

| builder = Kolomna Locomotive Works
Hanomag
Henschel & Son
Sormovo Works
Voroshilovgrad Locomotive Works
Kharkov Locomotive Factory

| ordernumber =

| serialnumber =

| buildmodel =

| builddate = 1892, 1894-1907

| totalproduction = 533

| rebuilder =

| rebuilddate =

| numberrebuilt =

| whytetype = {{whyte|4-6-0}}

| uicclass =

| DRGtype =

| driver =

| gauge = {{track gauge|1524mm}}

| leadingdiameter = {{convert|1030|mm|ftin|abbr=on}}

| driverdiameter = {{convert|1830|mm|ftin|abbr=on}}

| coupleddiameter =

| trailingdiameter =

| tenderdiameter =

| carrydiameter =

| minimumcurve =

| wheelbase =

| wheelspacing =

| engine total =

| leading =

| drivers =

| coupled =

| trailing =

| tender total =

| tendertruck =

| tenderbogie =

| wheelbasewithtender =

| racksystem =

| pivotcentres =

| length = {{convert|10.437|m|ftin|abbr=on}}

| over couplers =

| over headstocks =

| over buffers =

| width =

| height =

| frametype =

| axleload = {{convert|13.8-14|t|abbr=on}}

| 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 =

| emptyweight = {{convert|58|t|abbr=on}}

| serviceweight = {{convert|60.3|t|abbr=on}}
{{convert|63.5|t|abbr=on}}

| locoweight =

| tenderweight =

| locotenderweight =

| tendertype =

| fueltype =

| fuelcap =

| watercap =

| tendercap =

| sandcap =

| fireboxtype =

| firearea = {{convert|1.85|m2|sqin|abbr=on}}

| boiler =

| boilertype =

| pitch =

| diameterinside =

| lengthinside =

| smalltubediameter=

| largetubediameter=

| boilerpressure =

| safetyvalvetype =

| feedwaterheater =

| fireboxarea =

| tubearea =

| archarea =

| fluearea =

| tubesandflues =

| totalsurface =

| superheatertype =

| superheaterarea =

| cylindercount = Two, outside

| cylindersize = {{convert|500 x 710|mm|in|abbr=on}}
or {{convert|500 x 730|mm|in|abbr=on}}

| hpcylindersize =

| lpcylindersize =

| cogwheelbore =

| cogwheelstroke =

| cylinderpressure =

| valvegear =

| valvetype =

| valvetravel =

| valvelap =

| valvelead =

| transmission =

| trainheating =

| locobrakes =

| locobrakeforce =

| trainbrakes =

| safety =

| coupling =

| maxspeed = {{convert|115|km/h|mph|abbr=on}}

| indicatedpower =

| poweroutput =

| tractiveeffort =

| factorofadhesion =

| operator = Russian Imperial Railways
Soviet Railways

| operatorclass =

| powerclass =

| numinclass =

| fleetnumbers =

| officialname =

| nicknames =

| axleloadclass =

| locale =

| deliverydate =

| firstrundate =

| lastrundate =

| retiredate =

| withdrawndate =

| preservedunits =

| restoredate =

| scrapdate =

| currentowner =

| disposition =

| notes =

}}

The Russian locomotive class A was a series of Russian steam locomotives from the early 20th century, among the most powerful produced in the country at that time, with a top speed of 115 kilometers per hour.{{cite web |url=https://www.wdl.org/en/item/5202/ |title=Steam Engine "Kompaund" with a Schmidt Super-Heater |author= |website=World Digital Library |publisher=Library of Congress |access-date=January 9, 2019 }}

One example, shown here, was the Ab type, with a Schmidt superheater, with the number between the couplers indicates Ab 132, produced at the Briansk locomotive factory in 1909.