Baden IV e

The locomotives of Baden Class IV e were designed and built for the Grand Duchy of Baden State Railway in the late 19th century by the Elsässischen Maschinenbau-Gesellschaft Grafenstaden, who supplied the first eight examples in 1894. They were the first locomotives in Germany with a 4-6-0 wheel arrangement. Another 75 locomotives were built up to 1901 by the Maschinenbau-Gesellschaft Karlsruhe.

Baden IV e
DRG Class 38.70
Werksfoto
Number(s)G.Bad.St.E: 18…356,
552–556, 575–595,
622–628, 664–690
DRG: 38 7001–7007,
38 7021–7025,
38 7031–7034,
38 7041–7046,
38 7061–7073
Quantity83
ManufacturerGrafenstaden,
MBG Karlsruhe
Year(s) of manufacture1894–1901
Retiredby 1932
Wheel arrangement4-6-0
Axle arrangement2′C n4v
Track gauge1,435 mm (4 ft 8 1⁄2 in)
Length over buffers16,960 mm (55 ft 8 in)
Height4,150 mm (13 ft 7 in)
Bogie wheelbase1,900 mm (6 ft 3 in)
Wheelbase3,600 mm (11 ft 10 in)
Overall wheelbase7,450 mm (24 ft 5 in)
Wheelbase incl. tender14,875 mm (48 ft 9.6 in)
Empty weight52.80 t
Service weight58.30 t
Adhesive weight41.70 t
Axle load13.90 t
Top speed90 km/h (56 mph)
Indicated Power778–811 indicated horsepower (580–605 kW)
Coupled wheel diameter1,600 mm (5 ft 3 in)
Driving wheel diameter1,600 mm (5 ft 3 in)
Leading wheel diameter850 mm (2 ft 9 in)
Valve gearWalschaerts (Heusinger)
No. of cylinders4
LP cylinder bore350 mm (14 in)
HP cylinder bore550 mm (22 in)
Piston stroke640 mm (25 in)
Boiler Overpressure13 bar (189 psi)
No. of heating tubes191
Heating tube length4,250 mm (13 ft 11 in)
Grate area2.10 m2 (22.6 sq ft)
Radiative heating area11.17 m2 (120.2 sq ft)
Evaporative heating area125.93 m2 (1,355.5 sq ft)
Tenderbad. 2'2' T 15
Water capacity15 m3 (4,000 US gal)
Fuel5 t coal
Locomotive brakesWestinghouse Henry brake

History

The Baden IV e engines were created primarily for express and passenger train duties on the steep lines of the Schwarzwaldbahn. This had become necessary, because the locomotives that had been employed hitherto, the IV b, IV c tender locomotives and the IV d tank engines, were unable to meet the growing demands placed on them.

In France, the Compagnie des chemins de fer du Midi, purchased a copy of this engine for its difficult Béziers-Neussargues line. It proved successful and 30 others were built, in France (Midi 1401 to 1431) and were still running in 1938. Also, Midi 1301 to 1470 are closely related but with bigger drivers. The Chemins de Fer du Nord borrowed one of these engines and quickly ordered 50 of them. These were the first engines of the very successful Nord 3.078 to 3.354 (built between 1897 and 1913 ; withdrawn between the 1940s and 1962).

In 1914 all the engines were still on the books of the Baden state railway. However they were replaced in the express service role as early as 1903 by the II d and IV f. In 1925, the Deutsche Reichsbahn incorporated the remaining 35 examples into DRG Class 38.70; they were given – in groupings based on their delivery batches – the running numbers 38 7001 – 38 7007, 38 7021 – 38 7025, 38 7031 – 38 7034, 38 7041 – 38 7046 and 38 7061 – 38 7073. The engines were all withdrawn from service by 1932.

Fifteen locomotives were surrendered as reparations:

  • Thirteen locomotives were handed over to France; there were assigned to the Chemin de fer de l'État and were renumbered 230-901 to 230-913. They were retired between 1929 and 1937.
  • Two locomotives went to the État-Belge (Belgian State Railway, the forerunner of today's SNCB). They were withdrawn in 1924.

Number 38 7001 was sectioned in September 1936 and was displayed in the University of Karlsruhe (TH). The facility was bombed in 1944 and the burned remains of 38 7001 were sold for scrap after the war.

Design features

In spite of the shortcomings in ride of the Grafenstaden outside-frame bogies, the locomotive had smooth riding qualities. The engine had a riveted interior plate frame and the coupled wheels had springs under the axle boxes, that were not linked by compensating levers.

An innovative feature, for Germany, of the IV e was the use of a four-cylinder, de Glehn compound, that was employed for the first time on a locomotive with three coupled axles. The Alsace engineering company had previously built four-coupled locomotives with De-Glehn engines – especially for the Chemins de Fer du Nord. Very similar engines to the Baden IV e were soon delivered to Prussia (as the Prussian P 7), to the Imperial Railways in Alsace-Lorraine (as the P 7 and S 9), and to most French railways, as well as to Belgium, Spain and Portugal.

The high-pressure cylinder was outside and drove the middle coupled wheels, whilst the inside low-pressure cylinders drove the leading coupled axle. These two cylinders were slightly angled.

The compound engine was chosen to strike a balance between the high tractive effort required when hauling uphill which would be provided by smaller diameter wheels and the lower axle forces when running downhill that favoured larger wheel diameters. The low and high pressure engines could be controlled separately. This made it easier to start up. On trial runs on routes with an incline of 17.6‰ (1 in 56.8) a power of 581 to 636 indicated horsepower (433 to 474 kW) was measured for a speed of 30 km/h (19 mph). The highest value was between 778 and 811 ihp (580 and 605 kW). With a 250 tonne train, it could reach a speed of 75 km/h (47 mph) on the level and 40 km/h (25 mph) on an incline of 10‰ (1 in 100).

The locomotives were equipped with tenders of the Baden classes 3 T 13,5, bad 3 T 14 and bad 2′2′ T 15.

See also

References
  • Hermann Lohr, Georg Thielmann: Lokomotiv-Archiv Baden. transpress, Berlin 1988, ISBN 3-344-00210-4
  • Manfred Weisbrod, Hans Müller, Wolfgang Petznick: Deutsches Lok-Archiv: Dampflokomotiven 1 (Baureihen 01 - 39) transpress, Berlin 1993, ISBN 3-344-70768-X


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