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{{Infobox locomotive
| name = DR Class 22
| bgcolor = A00
| color = FFF
| image = BR 22 Nördlingen.jpg
| alt =
| caption = 22 064 in the Bavarian Railway Museum, 1998
| powertype = Steam
| designer =
| builder = [[Meiningen Steam Locomotive Works|RAW Meiningen]]
| ordernumber =
| serialnumber =
| buildmodel =
| builddate = 1958–1962
| totalproduction = 85
| rebuilder =
| rebuilddate =
| numberrebuilt =
| whytetype = {{whyte|2-8-2}}
| uicclass = 1′D1′ h3
| DRGtype = P 46.18
| driver = All cylinders to 2nd
| gauge = {{track gauge|sg}}
| leadingdiameter = {{convert|1000|mm|ftin|frac=4|abbr=on}}
| driverdiameter = {{convert|1750|mm|ftin|frac=8|abbr=on}}
| trailingdiameter = {{convert|1100|mm|ftin|frac=4|abbr=on}}
| tenderdiameter = {{convert|1000|mm|ftin|frac=4|abbr=on}}
| carrydiameter =
| minimumcurve =
| wheelbase =
| wheelspacing = {{ubl|{{convert|2800|mm|ftin|frac=4|sigfig=3|abbr=on}} +|{{convert|2000|mm|ftin|frac=4|sigfig=3|abbr=on}} +|{{convert|2000|mm|ftin|frac=4|sigfig=3|abbr=on}} +|{{convert|2000|mm|ftin|frac=4|sigfig=3|abbr=on}} +|{{convert|3350|mm|ftin|frac=4|sigfig=3|abbr=on}} {{=}}}}
| engine total = {{convert|12150|mm|ftin|frac=4|abbr=on}}
| leading =
| drivers = 
| coupled = 
| trailing =
| tender total = {{ubl|{{convert|1900|mm|ftin|frac=4|sigfig=3|abbr=on}} +|{{convert|1900|mm|ftin|frac=4|sigfig=3|abbr=on}} +|{{convert|1900|mm|ftin|frac=4|sigfig=3|abbr=on}} {{=}}|{{convert|5700|mm|ftin|frac=4|sigfig=3|abbr=on}}}}
| tendertruck = 
| tenderbogie = 
| wheelbasewithtender = {{convert|20070|mm|ftin|frac=4|abbr=on}}
| racksystem =
| pivotcentres = 
| length =
| over headstocks = {{convert|22400|mm|ftin|frac=8|abbr=on}}
| over buffers = {{convert|23700|mm|ftin|frac=8|abbr=on}}
| width =
| height = {{convert|4500|mm|ftin|frac=16|abbr=on}}
| frametype =
| axleload = {{convert|18.5|t|abbr=on}}
| leadingbogie/pony= 
| coupled all = 
| coupled 1 = 
| coupled 2 = 
| coupled 3 = 
| coupled 4 =
| trail bogie/pony= 
| tenderbogieload = 
| tenderaxle = 
| weightondrivers = {{convert|74.0|t|abbr=on}}
| emptyweight = {{convert|96.4|t|abbr=on}}
| serviceweight = {{convert|107.5|t|abbr=on}}
| locoweight =
| tenderweight =
| locotenderweight =
| tendertype = 2′2′ T 32/34 (22 001 with 2′2 T 30 from [[DR Class 25.10|25 001]])
| fueltype = Coal
| fuelcap = {{convert|10|t|abbr=on}}
| watercap = {{ubl|2′2′ T 32: {{convert|32.0|m3|impgal usgal|abbr=on}}|2′2′ T 34:
{{convert|34.0|m3|impgal usgal|abbr=on}}|2′2′ T 30: {{convert|30.0|m3|impgal usgal|abbr=on}}}}
| tendercap =
| sandcap =
| fireboxtype = 
| firearea = {{convert|4.23|m2|abbr=on}}
| boiler = 
| boilertype = 
| pitch = {{convert|3050|mm|ftin|frac=8|abbr=on}}
| diameterinside =
| lengthinside = {{convert|5700|mm|ftin|frac=8|abbr=on}}
| smalltubediameter= {{convert|54|mm|in|frac=16|abbr=on}}, 112 off
| largetubediameter= {{convert|143|mm|in|frac=16|abbr=on}}, 36 off
| boilerpressure = {{convert|16|bar|kgf/cm2 psi|sigfig=3|abbr=on}}
| safetyvalvetype = 
| feedwaterheater =
| fireboxarea = {{convert|21.3|m2|abbr=on}}
| tubearea = {{convert|98.3|m2|abbr=on}}
| archarea =
| fluearea = {{convert|86.7|m2|abbr=on}}
| tubesandflues =
| totalsurface = {{convert|206.3|m2|abbr=on}}
| superheatertype =
| superheaterarea = {{convert|83.8|m2|abbr=on}}
| cylindercount = Three
| cylindersize = {{convert|520|x|660|mm|in|frac=16|abbr=on}}
| cylinderpressure =
| valvegear = Outside [[Walschaerts valve gear|Heusinger (Walschaerts)]] with ''Winterthur'' slide
| valvetype =
| valvetravel =
| valvelap =
| valvelead =
| transmission =
| trainheating = Steam
| locobrakes =
| locobrakeforce =
| trainbrakes =
| safety =
| coupling =
| maxspeed = {{convert|110|km/h|mph|0|abbr=on}}
| indicatedpower = {{convert|1690|PS|kW hp|abbr=on}}
| poweroutput =
| tractiveeffort =
| factorofadhesion =
| operator = [[Deutsche Reichsbahn (GDR)|Deutsche Reichsbahn]]
| operatorclass =
| powerclass =
| numinclass =
| fleetnumbers = 22 001 – 22 085
| officialname =
| nicknames =
| axleloadclass =
| locale =
| deliverydate =
| firstrundate =
| lastrundate =
| retiredate = 1971
| withdrawndate =
| preservedunits =
| restoredate =
| scrapdate =
| currentowner =
| disposition =
| notes =
}}
The [[steam locomotive]]s of '''DR Class 22''' were reconstructed [[passenger train]] locomotives in service with the [[Deutsche Reichsbahn (GDR)|Deutsche Reichsbahn]] in [[East Germany]] after the [[Second World War]].

These engines were rebuilt from [[Prussian P 10|DRG Class 39.0-2]] locomotives and appeared between 1958 and 1962 as part of the [[Rekolok|reconstruction programme]]. The latter had a significant problem: the [[boiler]] did not generate enough steam and the steam pipes were too winding, which considerably reduced the maximum power of the engine. A total of 85 examples were equipped with a new [[Firebox (steam engine)#Combustion chamber|combustion-chambered]] boiler with an ''IfS'' mixer-[[preheater]]. The [[locomotive frame]] had to be extended to accommodate the new engine. The wider outer firebox meant that the driver's cab needed a modified rear wall. The locomotives were given operating numbers 22 001–085 and were mainly homed in the Reichsbahn divisions of [[Dresden]] and [[Erfurt]].

The DR employed the locomotives on heavy express train duties in the schedules for the [[DRG Class 01]], which led to overloading of the original components (frame cracks, piston damage). As a result, early retirement followed.
In 1968, 50 of the 85 ''Reko'' boilers from the Class 22 were used for the reconstruction of the [[DRG Class 03]].

In 1970 the engines were allocated to '''Class 39''' under the DR's new computerised numbering scheme. However, in 1970 only a few machines were still working, at [[Halberstadt]] and [[Saalfeld]]. In 1971 the last one was withdrawn. Up to the early 1990s, nine engines were used as steam generators.

The vehicles were equipped with 2′2′ T 32 or 2′2′ T 34 [[tender (rail)|tenders]].

== See also ==
* [[List of East German Deutsche Reichsbahn locomotives and railbuses]]
* [[Rekolok]]
* [[List of preserved steam locomotives in Germany]]

== References ==
* {{cite book| first1=R.| last1=Heinrich| first2=H.| last2=Schnabel| title=Die Baureihe 22| publisher=EK-Verlag| location=Freiburg| year=2001| isbn=978-3-88255-122-8}}
* {{Hütter-01bis45|pages=209–212}}
* {{Weisbrod-EFA1.1|pages=172–174}}

== External links ==
* [https://web.archive.org/web/20071014225625/http://private-nbahn.de/ Bilder und Daten historischer Loks]

{{German steam locomotives}}

[[Category:Steam locomotives of Germany|22]]
[[Category:2-8-2 locomotives]]
[[Category:Deutsche Reichsbahn (East Germany) locomotives|22]]
[[Category:Railway locomotives introduced in 1958]]
[[Category:Passenger locomotives]]
[[Category:Standard-gauge locomotives of Germany]]
[[Category:1′D1′ h3 locomotives]]

DR Class 22 - Revision history

imported>Iain Bell: add reference