Opladen, now a district of Leverkusen, used to be the capital of the Rhein-Wupper-Kreis (Rhine-Wupper-District) until 1975. Opladen station is located 15 kilometres (9.3 mi) northeast from Cologne on the railway to Wuppertal. It is also on the Autobahn A3. Population (1905) was 6338, (1975) 42,000.