on 1 July the second youth hostel in the world, and the first in the Rhineland, celebrated its inauguration. The 20th century from the First World War to 1945 Radevormwald developed into an industrial location. Local businesses included lock-, file-, bicycle-, paper-, ice-skate- and building component factories, motor and textile industries, yarn-spinning and cloth mills. At 8:15 on the morning of 26 May 1928 a Deutsche Luft Hansa Junkers F13 airplane crashed in Hahnenberg on the Schlegel meadow (Schlegelsche Wiese), killing three people. In November 1934, the connection of a gas pipeline caused the gasworks to moderate its production of town gas. The 20th century from 1945 Bismarck motorcycles In 1957, Bismarck motorcycle production ended in Bergerhof. The Dahlerau train disaster On the evening of 27 May 1971, a Deutsche Bundesbahn railbus ran as a special service on the Wuppertal—Radevormwald line. The train was full of schoolchildren on a school outing and was about 30 minutes behind schedule. An oncoming freight train failed to stop for reasons unclear, and collided with the railbus. 46 passengers died in the accident, including 41 schoolchildren. 25 passengers were injured, most of them seriously. The exact cause of the accident could not be determined, because the station controller died in a car accident shortly after the event. The surviving driver of the goods train stated at the inquest that the train controller had signalled green with his flashlight, indicating a free passage. None of the railway stations on this local branch line had a proper station exit signal. Almost all of the dead schoolchildren were buried at the municipal cemetery in Radevormwald in a common enclosure with a stone monument inscribed: Come spirit of the four winds and breathe on these dead, that they may come alive (Komme Geist von den vier Winden herbei und hauche diese Toten an, damit sie lebendig werden). This accident was the worst rail disaster in West Germany until the Eschede train disaster in 1998. From 1975 - Radevormwald in the Oberbergischer district On 1 January 1975 the Rhein-Wupper and Rheinisch-Bergisch districts were merged and Radevormwald became part of the resulting Oberbergischer district. A year later, on 28 May 1976 regular passenger traffic on the railway to Radevormwald ended. Since the 1950s construction of the Wuppertal dam had been planned. In the mid-1980s the many years of preparation concluded, and construction began. Numerous places had to be demolished, so