Baden IV e
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|Baden IV e
DRG Class 38.70
DRG: 38 7001–7007,
|Year(s) of manufacture||1894–1901|
|Axle arrangement||2′C n4v|
|Track gauge||1,435 mm (4 ft 8 1⁄2 in)|
|Length over buffers||16,960 mm (55 ft 8 in)|
|Height||4,150 mm (13 ft 7 in)|
|Bogie wheelbase||1,900 mm (6 ft 3 in)|
|Wheelbase||3,600 mm (11 ft 10 in)|
|Overall wheelbase||7,450 mm (24 ft 5 in)|
|Wheelbase incl. tender||14,875 mm (48 ft 9.6 in)|
|Empty weight||52.80 t|
|Service weight||58.30 t|
|Adhesive weight||41.70 t|
|Axle load||13.90 t|
|Top speed||90 km/h (56 mph)|
|Indicated Power||778–811 indicated horsepower (580–605 kW)|
|Coupled wheel diameter||1,600 mm (5 ft 3 in)|
|Driving wheel diameter||1,600 mm (5 ft 3 in)|
|Leading wheel diameter||850 mm (2 ft 9 in)|
|Valve gear||Walschaerts (Heusinger)|
|No. of cylinders||4|
|LP cylinder bore||350 mm (14 in)|
|HP cylinder bore||550 mm (22 in)|
|Piston stroke||640 mm (25 in)|
|Boiler Overpressure||13 bar (189 psi)|
|No. of heating tubes||191|
|Heating tube length||4,250 mm (13 ft 11 in)|
|Grate area||2.10 m2 (22.6 sq ft)|
|Radiative heating area||11.17 m2 (120.2 sq ft)|
|Evaporative heating area||125.93 m2 (1,355.5 sq ft)|
|Tender||bad. 2'2' T 15|
|Water capacity||15 m3 (4,000 US gal)|
|Fuel||5 t coal|
|Locomotive brakes||Westinghouse Henry brake|
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.
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 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) and were classified as Type 61.
Number 38 7001 was sectioned in September 1936 and is displayed today in the University of Karlsruhe (TH).
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.
- 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
- There is a relevant English-language forum at Railways of Germany