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{{Short description|Class of German 4-6-2 locomotives (1925-1942)}}
{{no footnotes|date=July 2016}}
{{Infobox locomotive
| name = DRG Class 02
| bgcolor = A00
| color = FFF
| image = WP Schnellzuglok BR 02.jpg
| alt =
| caption = 02 008 in June 1932
| powertype = Steam
| designer =
| builder = {{ubl|[[Henschel & Sohn]] (8)|[[Maffei (company)|Maffei]] (2)}}
| ordernumber =
| serialnumber = {{ubl|Henschel 20460–20467|Maffei 5621–5622}}
| buildmodel =
| builddate = 1925–1926
| totalproduction = 10
| rebuilder =
| rebuilddate =
| numberrebuilt =
| whytetype = {{whyte|4-6-2}}
| uicclass = 2{{prime}}C1{{prime}} h4v
| DRGtype = S 36.20
| driver = 2nd coupled axle for all cylinders
| gauge = {{track gauge|sg}}
| leadingdiameter = {{0|0,}}{{convert|850|mm|in|frac=8|abbr=on}}
| driverdiameter = {{convert|2000|mm|in|frac=8|abbr=on}}
| trailingdiameter = {{convert|1250|mm|in|frac=8|abbr=on}}
| tenderdiameter = 
| carrydiameter =
| minimumcurve =
| wheelbase =
| engine total =
| leading =
| drivers = 
| coupled = 
| trailing =
| tender total =
| tendertruck = 
| tenderbogie = 
| wheelbasewithtender = {{convert|20320|mm|ftin|frac=4|abbr=on}}
| wheelspacing = {{ubl|{{convert|2200|mm|ftin|frac=8|abbr=on}} +|{{convert|1800|mm|ftin|frac=8|abbr=on}} +|{{convert|2300|mm|ftin|frac=8|abbr=on}} +|{{convert|2300|mm|ftin|frac=8|abbr=on}} +|{{convert|3800|mm|ftin|frac=8|abbr=on}}}}
| length =
| over buffers = {{convert|23750|mm|ftin|frac=4|abbr=on}}
| over headstocks =
| width =
| height = {{convert|4.550|m|ftin|frac=8|abbr=on}}
| frametype =
| axleload = {{convert|20.1|t}}
| leadingbogie/pony= 
| coupled all = 
| coupled 1 = 
| coupled 2 = 
| coupled 3 = 
| trail bogie/pony= 
| tenderbogieload = 
| tenderaxle = 
| weightondrivers = {{convert|60.3|t}}
| emptyweight = {{convert|103.9|t}}
| serviceweight = {{convert|113.5|t}}
| locoweight =
| tenderweight =
| locotenderweight =
| tendertype = 2{{prime}}2 T 32 (2{{prime}}2 T 30)
| fueltype = Coal
| fuelcap = {{convert|10.0|t}}
| watercap = {{convert|32|or|30|m3|impgal usgal|sigfig=3|abbr=on}}
| tendercap =
| sandcap =
| fireboxtype = 
| firearea = {{convert|4.41|m2|abbr=on}}
| boiler = 
| boilertype = 
| pitch = {{convert|3100|mm|ftin|frac=8|abbr=on}}
| diameterinside =
| lengthinside = {{convert|5800|mm|ftin|frac=8|abbr=on}}
| smalltubediameter= {{convert|54|mm|in|frac=16|abbr=on}}, 129 off
| largetubediameter= {{convert|143|mm|in|frac=16|abbr=on}}, 43 off
| boilerpressure = {{convert|16|bar|kgf/cm2 psi|sigfig=3|abbr=on}}
| safetyvalvetype = 
| feedwaterheater =
| totalsurface = {{convert|237.56|m2|abbr=on}}
| tubearea = {{convert|115.18|m2|abbr=on}}
| archarea =
| fluearea = {{convert|105.38|m2|abbr=on}}
| tubesandflues =
| fireboxarea = {{convert|17.0|m2|abbr=on}}
| superheatertype =
| superheaterarea = {{convert|100.0|m2|abbr=on}}
| cylindercount = Four (compound): two high-pressure (HP) inside, two low-pressure (LP) outside
| hpcylindersize = {{convert|460|x|660|mm|in|frac=16|abbr=on}}
| lpcylindersize = {{convert|720|x|660|mm|in|frac=16|abbr=on}}
| cylinderpressure =
| valvegear = [[Walschaerts valve gear|Walschaerts]] (Heusinger)
| valvetype =
| valvetravel =
| valvelap =
| valvelead =
| transmission =
| trainheating = Steam
| locobrakes = Knorr single-chamber, [[Railway air brake|compressed air brakes]], operating on front of all coupled wheels
| locobrakeforce =
| trainbrakes =
| safety =
| coupling =
| maxspeed = {{ubl|fwds: {{convert|130|km/h|mph|0|abbr=on}}|bwds: {{convert|50|km/h|mph|0|abbr=on}}}}
| indicatedpower = {{convert|2300|PS|kW hp|sigfig=3|abbr=on}}
| poweroutput =
| tractiveeffort =
| factorofadhesion =
| operator =
| operatorclass =
| powerclass =
| numinclass =
| fleetnumbers = DRG 02 001 to 02 010
| officialname =
| nicknames =
| axleloadclass =
| locale =
| deliverydate =
| firstrundate =
| lastrundate =
| retiredate =
| withdrawndate =
| preservedunits =
| restoredate =
| scrapdate =
| currentowner =
| disposition = Rebuilt to DRG Class 01 (1937–1942)
| notes =
}}
The German '''DRG Class 02''' (''Baureihe 02'' or ''BR 02'') engines were standard (''[[Einheitsdampflokomotive|Einheitslokomotive]]n'') express train locomotives with the [[Deutsche Reichsbahn-Gesellschaft]]. Number 02 001 was the first ''[[Einheitsdampflokomotive]]'' in the [[Deutsche Reichsbahn-Gesellschaft|DRG]] to be completed.

In procuring a standard [[express train]] steam locomotive, the Deutsche Reichsbahn carried out a comparison between a [[superheated]] two-[[Cylinder (locomotive)|cylinder]] type (the [[DRG Class 01]]) and a four-cylinder [[compound locomotive]] (the '''Class 02'''). Ten examples of each type were built from 1925, and the Class 02 vehicles were given operating numbers 02 001 – 02 010. The first eight engines were manufactured in 1925 by the firm of [[Henschel]], two more were built in 1926 by [[Maffei (company)|Maffei]].

Because the Class 02 steam engines were badly designed, the compound engine could only produce a high level of power at speeds of over 70 km/h. In addition, below 100 PSi its steam consumption was higher than that of the Class 01.

Compared with the Class 01s, these engines had a complicated, and therefore maintenance-intensive, drive; as a result no more were ordered. From 1937 to 1942 the vehicles were successively converted to two-cylinder simple operation and regrouped as Class 01s with the new numbers 01 011 and 01 233 to 01 241.

The first eight engines were equipped with 2'2' T 30 [[Tender (locomotive)|tender]]s; the other two with 2'2 T 32 tenders. Later on, the second tender was coupled to all of the first eight engines as well.

==See also==
* [[List of DRG locomotives and railbuses]]

== Literature ==
* {{cite book |last1=Maidment |first1=David |title=The German Pacific Locomotive: Its Design and Development |series=Locomotive Portfolios series |date=2017 |publisher=Pen & Sword Transport |location=Barnsley, South Yorkshire, UK |isbn=9781473852495}}
* {{cite book| title=Deutsche Eisenbahnen| publisher=Weltbild Verlag| language=de}}{{full|date=July 2016}}
* {{cite book| last1=Weisbrod |first1=Manfred |last2=Petznick |first2=Wolfgang |title=Baureihe 01| publisher=Transpress Verlag| language=de}}{{full|date=July 2016}}
* {{cite book| title=Großes Lok-Portrait 01.05| publisher=EK Verlag| location=Freiburg| language=de}}{{full|date=July 2016}}
* {{Hütter-01bis45|page=73}}
* {{cite book| first=Konrad| last=Koschinski| title=Legendäre Baureihe 01| publisher=Verlagsgruppe Bahn| year=2006| series=Eisenbahn-Journal| edition=Sonderausgabe 2006,2| isbn=3-89610-156-0| language=de}}
* {{Weisbrod-EFA1.1|pages=36–38, 242}}

== External links ==
* [http://www.nicospilt.com/duitsland_02.htm Photos of locomotive 02 003]

{{DRG locomotives}}

[[Category:Steam locomotives of Germany|02]]
[[Category:4-6-2 locomotives]]
[[Category:Deutsche Reichsbahn-Gesellschaft locomotives|02]]
[[Category:Henschel locomotives]]
[[Category:Railway locomotives introduced in 1925]]
[[Category:Compound locomotives]]
[[Category:Maffei locomotives]]
[[Category:Passenger locomotives]]
[[Category:Standard-gauge locomotives of Germany]]
[[Category:2′C1′ h4v locomotives]]

DRG Class 02 - Revision history

imported>Iain Bell: add reference