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BR 18.4

The purchase of the locomotives of type IV f by the Badische Staatsbahn gave the Bayerische Staatsbahnen occasion to purchase similar pacific steam locomotive meant for the heavy express train services. Also because the locomotives S 3/5 could not manage any more these services in the future. The first locomotives type S 3/6 were delivered by Maffei on 16 July 1908 to the Bavarian railways. Characteristic for these locomotives is that the locomotives were 25 years long purchased, even in the DRG era. The S 3/6 had a four cylinder transmission that was coupled with the second driving axle. The diameter of the driving wheels was 1870 mm, this diameter made the locomotives very suitable for services in the hilly areas of Bavarian. But also on the flatlands the locomotives were very good due to the well-balanced transmission and the high top speed. After seven locomotives built in 1908, there followed in 1911 the series a up to c with in total 16 locomotives. In 1912 and 1913 were the series d and e built, these locomotives had driving wheels with a diameter of 2000 mm.

The series d and e contained in total nine locomotives S 3/6. The locomotives were specially built for the express train services on the lines München-Nürnberg and München-Würzburg. These locomotives had the same cylinder diameter as the series a up to c. The wheel sets were increased from 11 365 mm to 11 420 mm. The center of the boiler was with it's 2920 mm approximately 65 mm higher. The cabin of this series had no windshields. And the tenders were of a new generation: the 2'2T 32,5.

The series f, built in 1913, contained only 3 locomotives. For the Pfalz Railway was in 1914 the series g built, these series g differed from the series a up to c and f in dimensions. The locomotives became 150 mm shorter so that these steam locomotives could be used with the 19 meter long turntables of the Pflaz railways. The locomotives got a tender of type 2'2'T 26,2. The series g contained 10 locomotives.

With the series h and i with 35 locomotives, who were built during the first world war ended the first purchasing round of the S 3/6.

In service at the DRG

The DRG took over all locomotives and gave them the indication BR 18.4. The locomotives got the numbers: 18 401 up to 18 478 (the numbers 18 435 up to 440 and 18 459 and 460 were not used). The locomotives of the series d and e got the numbers: 18 441 up to 18 449 and 18 450 up to 18 458. The series g got the numbers: 18 425 up to 18 434. The 18 434 was after the second world war located in Dresden and was exchanged with the DR for the 18 314 (Bad. IV a).

Locomotive BR 18 484
Locomotive BR 18 484

Locomotive: Bay. S 3/6 Bay. S 3/6 Bay. S 3/6
Serie: a,b, c, f, h, i d, e g
Axle layout: 2'C1 h4v 2'C1 h4v 2'C1 h4v
In service: 1908-1918 1912 1914
Diameter driving wheels: 187 cm 200 cm 187 cm
Diameter carrying wheels: 95 cm/120,6 cm 95 cm/120,6 cm 95 cm/120,6 cm
Length: 21,936 m (bay. 2'2'T26,2) 22,095 m (bay. 2'2'T32,5) 22,095 m (bay. 2'2'T26)
Top speed: 120 km/h 120 km/h 120 km/h
Power: 1770 pk/hp 1770 pk/hp 1770 pk/hp
Boiler pressure: 15 bar 15 bar 15 bar
Weight: 88,3 t 91,6 t 89,7 t