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{{Short description|Class of 28 German 2-10-2 locomotives (1936-1968)}}
{{more citations needed|date=December 2021}}
{{Infobox locomotive
| name = DRG Class 45
| bgcolor = A00
| color = FFF
| image = Dampflok 45.jpg
| alt =
| caption = 45 010 in the [[DB Museum, Nuremberg]]
| powertype = Steam
| designer =
| builder =
| ordernumber = [[Henschel & Sohn]]
| serialnumber = 22805–22806, 24796–24821
| buildmodel =
| builddate = 1937–1940
| totalproduction = 28
| rebuilder =
| rebuilddate =
| numberrebuilt =
| whytetype = {{whyte|2-10-2}}
| uicclass = 1′E1′ h3
| DRGtype = G 57.18 (also G 57.20)
| driver = Divided: inner cylinder on 2nd coupled axle, outer on 3rd
| gauge = {{track gauge|sg}}
| leadingdiameter = {{convert|1000|mm|ftin|frac=8|abbr=on}}
| driverdiameter = {{convert|1600|mm|ftin|frac=8|abbr=on}}
| trailingdiameter = {{convert|1250|mm|ftin|frac=8|abbr=on}}
| tenderdiameter = 
| carrydiameter =
| minimumcurve =
| wheelbase =
| wheelspacing = {{ubl|{{convert|3000|mm|ftin|frac=8|abbr=on}} +|{{convert|1850|mm|ftin|frac=8|abbr=on}} +|{{convert|1850|mm|ftin|frac=8|abbr=on}} +|{{convert|1850|mm|ftin|frac=8|abbr=on}} +|{{convert|1850|mm|ftin|frac=8|abbr=on}} +|{{convert|3200|mm|ftin|frac=8|abbr=on}} {{=}}}}
| engine total = {{convert|13600|mm|ftin|frac=8|abbr=on}}
| leading =
| drivers = 
| coupled = 
| trailing =
| tender total = {{ubl|{{convert|1750|mm|ftin|frac=8|abbr=on}} +|{{convert|1500|mm|ftin|frac=8|abbr=on}} +|{{convert|1375|mm|ftin|frac=8|abbr=on}} +|{{convert|1375|mm|ftin|frac=8|abbr=on}} {{=}}|{{convert|6000|mm|ftin|frac=8|abbr=on}}}}
| tendertruck = 
| tenderbogie = 
| wheelbasewithtender = {{convert|21775|mm|ftin|frac=8|abbr=on}}
| length =
| over headstocks = {{convert|24345|mm|ftin|frac=8|abbr=on}}
| over buffers = {{convert|25645|mm|ftin|frac=8|abbr=on}}
| width =
| height =
| frametype =
| axleload = {{ubl|''001–002:'' {{convert|18.6|or|19.9|t|abbr=on}}|''Remainder:'' {{convert|18.2|or|19.8|t|abbr=on}}|''Rebuilt:'' {{convert|18.2|-|18.6|or|19.4|-|19.9|t|abbr=on}}}}
| leadingbogie/pony= 
| coupled all = 
| coupled 1 = 
| coupled 2 = 
| coupled 3 = 
| coupled 4 =
| coupled 5 =
| trail bogie/pony= 
| tenderbogieload = 
| tenderaxle = 
| weightondrivers = {{ubl|''001–002:'' {{convert|92.9|or|99.4|t|abbr=on}}|''Remainder:'' {{convert|90.7|or|98.8|t|abbr=on}}|''Rebuilt:'' {{convert|91.0|-|93.0|or|97.2|-|99.7|t|abbr=on}}}}
| emptyweight = {{ubl|''001–002:'' {{convert|117.5|t|abbr=on}}|''Remainder:'' {{convert|114.7|t|abbr=on}}|''Rebuilt:'' {{convert|112.3|-|114.4|t|abbr=on}}}}
| serviceweight = {{ubl|''001–002:'' {{convert|128.4|t|abbr=on}}|''Remainder:'' {{convert|126.7|t|abbr=on}}|''Rebuilt:'' {{convert|125.5|-|128.5|t|abbr=on}}}}
| locoweight =
| tenderweight =
| locotenderweight =
| tendertype = {{ubl|''New:'' 2′3 T 38|''Rebuilt:'' 2′3 T 29}}
| fueltype = Coal
| fuelcap = {{ubl|''2′3 T 38:'' {{convert|10|t|abbr=on}}|''2′3 T 29:'' {{convert|12|t|abbr=on}}}}
| watercap = {{ubl|''2′3 T 38:'' {{convert|38|m3|impgal usgal|sigfig=3|abbr=on}}|''2′3 T 29:'' {{convert|29|m3|impgal usgal|sigfig=3|abbr=on}}}}
| tendercap =
| sandcap =
| fireboxtype = 
| firearea = {{ubl|''001–002:'' {{convert|5.0|m2|abbr=on}}|''Remainder:'' {{convert|4.8|m2|abbr=on}}|''Rebuilt:'' {{convert|4.5|m2|abbr=on}}}}
| boiler = 
| boilertype = 
| pitch = {{convert|3060|mm|ftin|frac=8|abbr=on}}
| diameterinside =
| lengthinside = {{ubl|''New:'' {{convert|7500|mm|ftin|frac=16|abbr=on}}|''Rebuilt:'' {{convert|6500|mm|ftin|frac=16|abbr=on}}}}
| smalltubediameter= {{ubl|''001–002:'' {{convert|83|mm|in|frac=16|abbr=on}}, 72 off|''Remainder:'' {{convert|79|mm|in|frac=16|abbr=on}}, 98 off|''Rebuilt:'' {{convert|60|mm|in|frac=16|abbr=on}}, 106 off}}
| largetubediameter= {{ubl|''001–002:'' {{convert|191|mm|in|frac=16|abbr=on}}, 33 off|''Remainder:'' {{convert|185|mm|in|frac=16|abbr=on}}, 30 off|''Rebuilt:'' {{convert|152|mm|in|frac=16|abbr=on}}, 44 off}}
| boilerpressure = {{ubl|''new:'' {{convert|20|bar|kgf/cm2 psi|sigfig=3|abbr=on}}|''later:'' {{convert|16|bar|kgf/cm2 psi|sigfig=3|abbr=on}}}}
| safetyvalvetype = 
| feedwaterheater =
| fireboxarea = {{ubl|''001–002:'' {{convert|18.8|m2|abbr=on}}|''Remainder:'' {{convert|18.7|m2|abbr=on}}|''Rebuilt:'' {{convert|23.2|m2|abbr=on}}}}
| tubearea = {{ubl|''001–002:'' {{convert|130.0|m2|abbr=on}}|''Remainder:'' {{convert|168.5|m2|abbr=on}}|''Rebuilt:'' {{convert|116.9|m2|abbr=on}}}}
| archarea =
| fluearea = {{ubl|''001–002:'' {{convert|140.2|m2|abbr=on}}|''Remainder:'' {{convert|123.3|m2|abbr=on}}|''Rebuilt:'' {{convert|128.9|m2|abbr=on}}}}
| tubesandflues =
| totalsurface = {{ubl|''001–002:'' {{convert|289.0|m2|abbr=on}}|''Remainder:'' {{convert|310.5|m2|abbr=on}}|''Rebuilt:'' {{convert|269.0|m2|abbr=on}}}}
| superheatertype =
| superheaterarea = {{ubl|''001–002:'' {{convert|132.5|m2|abbr=on}}|''Remainder:'' {{convert|120.6|m2|abbr=on}}|''Rebuilt:'' {{convert|120.6|m2|abbr=on}}}}
| cylindercount = Three
| cylindersize = {{convert|520|x|720|mm|in|frac=16|abbr=on}}
| hpcylindersize =
| lpcylindersize =
| cogwheelbore =
| cogwheelstroke =
| cylinderpressure =
| valvegear = [[Heusinger valve gear]]
| valvetype = [[Piston valves]]
| valvetravel =
| valvelap =
| valvelead =
| transmission =
| trainheating = Steam
| locobrakes = [[Knorr brake|Single knorr air brake]]
| locobrakeforce =
| trainbrakes = [[Knorr brake]]
| safety =
| coupling = Screw Link
| maxspeed = {{convert|90|km/h|0|abbr=on}}
| indicatedpower = {{convert|2800|PS|kW hp|sigfig=3|abbr=on}} {{convert|3020|PS|kW hp|sigfig=3|abbr=on}} (45 003)
| poweroutput =
| tractiveeffort =
| factorofadhesion =
| operator =
| operatorclass =
| powerclass =
| numinclass =
| fleetnumbers = 45 001 – 45 028
| officialname =
| nicknames =
| axleloadclass =
| locale =
| deliverydate =
| firstrundate =
| lastrundate =
| retiredate = 1946–1968
| withdrawndate =
| preservedunits =
| restoredate =
| scrapdate =
| currentowner =
| disposition =
| notes =
}}
German '''Class 45''' [[steam locomotives]] were standard locomotives (''[[Einheitsdampflokomotive|Einheitslokomotive]]n'') designed by the [[Deutsche Reichsbahn-Gesellschaft|Deutsche Reichsbahn]] for hauling [[goods trains]].

== History ==
The Class 45 engines were the most powerful steam locomotives ever operated in Germany. They were built between 1936 and 1937 by the firm of [[Henschel]]. After the first two engines entered service, a further 26 units were delivered in 1940. However, the third order for another 103 machines was cancelled in 1941, because the outbreak of the [[Second World War]] favoured the construction of simpler wartime locomotives, the so-called ''[[Kriegslokomotive]]n''. The Class 45s were given the operating numbers 45 001 to 45 028.

After the war, boiler damage appeared very quickly that made a reduction of the [[boiler]] [[overpressure]] to 16 bar necessary. From 1950 therefore several [[Deutsche Bundesbahn]] machines were equipped with an outer [[Firebox (locomotive)|firebox]] with a combustion chamber and a mechanical underfeed stoker (''Rostbeschicker''). The engines with operating numbers 45 010, 45 016, 45 019, 45 021 and 45 023 were provided with welded boilers and underfeed stoker equipment.

In East Germany, the [[Deutsche Reichsbahn (East Germany)|Deutsche Reichsbahn's]] sole example, 45 024, was rebuilt into high pressure variant and renumbered H 45 024. It proved to be a failure and was retired in 1959. Parts of this locomotive (outside [[Cylinder (steam locomotive)|cylinders]], [[trailing wheels]] and the rear section of the [[locomotive frame]]) were used in building engine no. [[DR 18 201|18 201]].

[[File:Bundesarchiv Bild 183-09876-0003, Kohlenstaublok H45024.jpg|thumb|left|H 45 024 in Leipzig, 1951]]
[[File:Dampflok 45 010.jpg|thumb|left|Condition of 45 010 after the great fire]]

In 1968 the Deutsche Bundesbahn only had three examples left, which were used as braking and experimental engines by the Bundesbahn Central Office in [[Munich]] and [[Minden]]. They were no. 45 023, which was stabled in Munich, and nos. 45 010 and 45 019, which were stationed at Minden. On the evening of 17 October 2005 a fire destroyed the locomotive shed of the [[Nuremberg Transport Museum]] in Nuremberg, as a result of which the last preserved example of this class, the 45 010, was badly damaged. Plans were put in hand to restore it and this was completed during 2012.

This class was initially a faulty design, similar to the [[DRB Class 06]], because of its poor boiler. Following replacement of the boiler and the introduction of mechanical stoking the true qualities of this locomotive became clear. As well as being used as braking locomotives for the Bundesbahn Central Office, in their final years numbers 45 019 and 45 010 were used time and again for those heavy goods train duties that the [[DRG Class 44|Class 44]] locomotives had difficulties with.

The vehicles were coupled with 2′3 T 38 [[Tender locomotive|tenders]]. Those with underfeed stokers had 2′3 T 29 Stoker tenders.

{| class="wikitable" style="text-align:center"
|+ Table of DB locomotive withdrawals
! Year
! Quantity in service at start of year
! Quantity withdrawn
! Locomotive numbers
! Notes
|-
| 1946 || 27 || 1 || align=left | 45 002 || align=left |
|-
| 1953 || 26 || 12 || align=left | 45 001, 005–007, 013, 015, 017, 018, 025–028 || align=left |
|-
| 1955 || 14 || 2 || align=left | 45 004, 011 || align=left |
|-
| 1957 || 12 || 6 || align=left | 45 003, 008, 009, 014, 021, 022 || align=left | 021 reboilered
|-
| 1958 || 6 || 1 || align=left | 45 012 || align=left | later reinstated
|-
| 1959 || 5 or 6 || 1 || align=left | 45 020 || align=left |
|-
| 1961 || 5 || 1 || align=left | 45 012 || align=left |
|-
| 1964 || 4 || 1 || align=left | 45 016 || align=left | reboilered
|-
| 1968 || 3 || 2 || align=left | 045 019-7, 023-9 || align=left | reboilered
|-
| 1969 || 1 || 1 || align=left | 045 010-6 || align=left | reboilered; preserved
|-
|}

== See also ==
{{Commons category|DRG Class 45}}
* [[List of DRG locomotives and railbuses]]

== References ==
{{reflist}}
* {{Hütter-01bis45|pages=476–478}}
* {{cite book| first1=B.| last1=Seiler| first2=Jürgen U.| last2=Ebel| title=Die Baureihe 45| publisher=EK-Verlag| location=Freiburg| year=2006| isbn=978-3-88255-151-8| language=de}}
* {{Weisbrod-EFA1.2|pages=44–49, 198–199}}

{{DRG locomotives}}

[[Category:Steam locomotives of Germany|45]]
[[Category:1′E1′ h3 locomotives]]
[[Category:Deutsche Reichsbahn-Gesellschaft locomotives|45]]
[[Category:Henschel locomotives]]
[[Category:Railway locomotives introduced in 1936]]
[[Category:Standard-gauge locomotives of Germany]]
[[Category:2-10-2 locomotives]]
[[Category:Freight locomotives]]

DRG Class 45 - Revision history

imported>Iain Bell: add reference