View source for Saxon IIIb V

{{no footnotes|date=September 2016}}
{{Infobox locomotive
| name             = IIIb V <br /> DR Class 34.79
| bgcolor          = 698B69
| color            = FFFFFF
| image            = IIIb_V.jpg
| builder          = [[Sächsische Maschinenfabrik]], [[Chemnitz]]
| builddate        = 1889/1892
| totalproduction  = 18
| uicclass         = 1′B n2v
| gauge            = {{track gauge|sg}}
| driverdiameter   = {{convert|1560|mm|ftin|frac=8|abbr=on}}
| carrydiameter    = {{convert|1230|mm|ftin|frac=8|abbr=on}}
| overallwheelbase = {{convert|4550|mm|ftin|frac=4|abbr=on}} / {{convert|4950|mm|ftin|frac=4|abbr=on}}
| over bufferbeams = {{convert|13996|mm|ftin|frac=4|abbr=on}}
| height           = {{convert|4150|mm|ftin|frac=8|abbr=on}}
| axleload         = 13.9 t
| emptyweight      = 37.2 t
| serviceweight    = 41.0 t
| weightondrivers  = 27.8 t
| fuelcap          = 
| heatingtubes     = 180
| heatingtubelength= {{convert|3500|mm|ftin|frac=4|abbr=on}}
| boilerpressure   = {{convert|12|kg/cm2|kPa psi|sigfig=3|abbr=on}}
| tubearea         = {{convert|89.0|m2|sqft|abbr=on}}
| fireboxarea      = {{convert|1.82|m2|sqft|abbr=on}}
| radiativearea    = {{convert|8.0|m2|sqft|abbr=on}}
| evaporativearea  = {{convert|97.02|m2|sqft|abbr=on}}
| cylindercount    = 2
| pistonstroke     = {{convert|560|mm|in|frac=16|abbr=on}}
| hpcylindersize   = {{convert|650|mm|in|frac=16|abbr=on}}
| lpcylindersize   = {{convert|420|mm|in|frac=16|abbr=on}}
| valvegear        = Allan
| locobrakes       = Schleifer air brakes <br /> Westinghouse air brakes (refit)
| maxspeed         = {{convert|75|km/h|abbr=on}}
| fleetnumbers     = KSäStE: 501–518 <br /> DR: 34 7901 – 34 7902
| retiredate       = 1923
}}
The '''Saxon Class IIIb <math>\textstyle \mathfrak{V}</math>''' was a twin-coupled [[tender locomotive]] built for passenger services with the [[Royal Saxon State Railways]].

== History ==
Following the success with the [[compound locomotive]]s of [[Saxon VIb V|Class VIb V]], corresponding locomotives were procured for hauling [[passenger train]]s. Based on the design of the [[Saxon IIIb]] the Saxon Engineering Works (''Sächsische Maschinenfabrik'') built a compound engine. In the years 1889 and 1892 a total of 18 units of the IIIb V were built for passenger train duties. Because the engines apparently did not prove themselves, no further orders were placed.

In 1920, the [[Deutsche Reichsbahn (1920–1945)|Deutsche Reichsbahn]] took over some of the locomotives, but only two remaining engines were included in the new numbering scheme in 1924: numbers 34 7901 and 34 7902.

== Design features ==

The locomotives had a boiler made from three shell rings with a semi-circular cover which, in the area of the firebox, was tucked in it between the frame plates. The boiler was fed by two non-sucking [[injector]]s.

The steam engine was designed as a twin-cylinder compound engine with interior [[Allan valve gear]]. The high-pressure cylinder was placed on the right, the larger, low-pressure cylinder on the left. They drove the second [[coupled axle]].

The [[driving axle]]s were fixed in the [[locomotive frame|frame]], the leading [[carrying wheel]]s were designed as a Novotny-Klien axle.

The locomotives left the factory equipped with Schleifer [[railway air brake|compressed air brakes]]; these only braked the engine, however. Later, all the locomotives were fitted with [[Westinghouse air brake]]s.
The locomotiven were coupled to [[tender (rail)|tender]]s of Saxon Class sä 3 T 9.

== References ==
{{reflist}}
* {{cite book| first1=Fritz| last1=Näbrich| first2=Günter| last2=Meyer| first3=Reiner| last3=Preuß| title=Lokomotivarchiv Sachsen 1| publisher=transpress VEB Verlag für Verkehrswesen| location=Berlin| year=1983| language=de}}{{page needed|date=September 2016}}
* {{Näbrich-EFA2.1|pages=144–148, 210}}
* {{cite book| first1=Erich| last1=Preuß| first2=Reiner| last2=Preuß| title=Sächsische Staatseisenbahnen| publisher=transpress Verlagsgesellschaft| location=Berlin| year=1991| isbn=3-344-70700-0| language=de}}{{page needed|date=September 2016}}
* {{Weisbrod-EFA1.1|pages=196–198}}

{{commons category|Saxonian IIIb V}}
{{Saxon locomotives}}

{{DEFAULTSORT:Saxon 03b V}}
[[Category:Locomotives of Saxony|03b V]]
[[Category:Railway locomotives introduced in 1889]]
[[Category:Sächsische Maschinenfabrik locomotives]]
[[Category:Compound locomotives]]
[[Category:Standard-gauge locomotives of Germany]]
[[Category:2-4-0 locomotives]]
[[Category:1′B n2v locomotives]]
[[Category:Passenger locomotives]]