Saxon IIIb DRG Class 52.7 DRG Class 34.77–78
Manufacturers:	Esslingen Maschinenfabrik Esslingen Maschinenfabrik Esslingen , was a German engineering firm that manufactured locomotives, tramways, railway wagons, roll-blocks, technical equipment for the railways, , bridges, steel structures, pumps and boilers.-Founding:...	Schwartzkopf	Hartmann Sächsische Maschinenfabrik The Sächsische Maschinenfabrik in Chemnitz was one of the most important engineering companies in Saxony in the second half of the 19th century and the first two decades of the 20th century. Including its various predecessor businesses, the firm existed from 1837 until its liquidation in 1930, and...	Henschel
Quantity:	14 Rebuild from III Saxon III The Saxon Class III were early, four-coupled, tender locomotives operated by the Royal Saxon State Railways for express services. The Deutsche Reichsbahn grouped these engines in 1925 into their DRG Class 34.76.- History :...	32	157	15
Numbers:	274–287 52 7001	288–319 34 7701–7702	320–334 34 7721–7808	335–491
Entered service:	1874	1873-1876	1874-1901	1876
Retired:	by end of 1920s
Wheel arrangement Whyte notation The Whyte notation for classifying steam locomotives by wheel arrangement was devised by Frederick Methvan Whyte and came into use in the early twentieth century encouraged by an editorial in American Engineer and Railroad Journal... :	2-4-0 2-4-0 Under the Whyte notation for the classification of steam locomotives, 2-4-0 represents the wheel arrangement of two leading wheels on one axle, four powered and coupled driving wheels on two axles, and no trailing wheels....
Axle arrangement UIC classification The UIC classification of locomotive axle arrangements describes the wheel arrangement of locomotives, multiple units and trams. It is set out in the International Union of Railways "Leaflet 650 - Standard designation of axle arrangement on locomotives and multiple-unit sets". It is used in much... :	1'Bn2
Service weight:	34.6 t	35,8 t
Axle load Axle load The axle load of a wheeled vehicle is the total weight felt by the roadway for all wheels connected to a given axle. Viewed another way, it is the fraction of total vehicle weight resting on a given axle... :	11.5 t
Adhesive weight Adhesive weight Adhesive weight is the amount of a locomotive's weight that is applied to the driving wheels and so capable of delivering traction. The more weight applied to the driving wheels, the greater the locomotive's ability to haul a load. But if the weight on the driving wheels exceeds the axle load of... :	23.1 t	23.8 t
Length over buffers Buffer (rail transport) A buffer is a part of the buffers-and-chain coupling system used on the railway systems of many countries, among them most of those in Europe, for attaching railway vehicles to one another.... :	k.A.	13,854 / 13,050 mm
Driving wheel Driving wheel On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons...  diameter:	1,525 mm	1,560 mm
Carrying wheel diameter:	990 mm	1,035 mm
Top speed:	70 km/h	60 / 70 km/h
Boiler Boiler A boiler is a closed vessel in which water or other fluid is heated. The heated or vaporized fluid exits the boiler for use in various processes or heating applications.-Materials:...  overpressure Overpressure The term Overpressure is applied to a pressure difference, relative to a "normal" or "ambient" pressure, in various circumstances:* In engineering: the pressure difference over the wall thickness of a pressure vessel... :	8.5 bar	10 bar
Piston stroke:	560 mm
Cylinder bore:	406 mm
Grate area:	1.55 m²	1.60 / 166 m²
Evaporative heating area:	90.80 m²	92.93 m²
Brakes:	Countersteam brake Countersteam brake A countersteam brake is a brake on a steam locomotive that uses the engine to help brake the locomotive.It uses the working principle of steam cylinders fitted with slide or piston valves such that, by changing the configuration of the valve gear, the motion of the valves is also altered such that... Westinghouse Westinghouse Air Brake Company The railway air brake was invented by George Westinghouse of New York state in 1869. Soon after, he moved to Pittsburgh, Pennsylvania, where he established the Westinghouse Air Brake Company on September 28, 1869...  compressed-air brake

The Saxon Class III b were German steam locomotives built for the Royal Saxon State Railways

Royal Saxon State Railways

The Royal Saxon State Railways were the state-owned railways operating in the Kingdom of Saxony from 1869 to 1918...

 (Königlich Sächsische Staatseisenbahnen) in the late 19th century as tender locomotives for express train duties. In 1925, the Deutsche Reichsbahn

Deutsche Reichsbahn-Gesellschaft

The Deutsche Reichsbahn – was the name of the German national railway created from the railways of the individual states of the German Empire following the end of World War I....

 incorporated the engines into DRG Class 34.77-78.

Between 1873 and 1901, a total of 204 locomotives were delivered to the Royal Saxon State Railways by the firms of Hartmann

Sächsische Maschinenfabrik

The Sächsische Maschinenfabrik in Chemnitz was one of the most important engineering companies in Saxony in the second half of the 19th century and the first two decades of the 20th century. Including its various predecessor businesses, the firm existed from 1837 until its liquidation in 1930, and...

, Henschel and Schwartzkopff. During the course of their manufacture there were continual modifications. Eighteen were built as compound engines.

The Reichsbahn took over 91 machines and gave them the running numbers 34 7701, 34 7702,
34 7721–34 7808.

Rebuild of the Saxon Class III

Later, 14 engines of the Saxon Class III

Saxon III

The Saxon Class III were early, four-coupled, tender locomotives operated by the Royal Saxon State Railways for express services. The Deutsche Reichsbahn grouped these engines in 1925 into their DRG Class 34.76.- History :...

 were equipped with Nowotny steerable axles and also classified as Saxon IIIb locomotives. Of fourteen such engines, only one entered the Deutsche Reichsbahn where it was given the running number 52 7001.

The locomotives equipped with Saxon sä 3 T 7.5 und sä 3 T 9 tenders.

External links

• Technical data and photos of historical locos (German)
• There is a relevant English-language forum at Railways of Germany