region occurred in Brügge (in the municipality of Lüdenscheid) in, 1874, in Olpe in 1875 and in Wipperfürth in 1877. The connections there were too far from the Oberbergischer Kreis for passengers and profitable freight operations. For cost reasons, the railway was built as a branch line. In most places it was built right next to the road, straight through the villages. This would still be a problem at the beginning of the 20th century. Further evidence of cost savings are the stations of Ründeroth and Derschlag. Their entrance building were previously at Recklinghausen and Recklinghausen Süd. Since they were no longer large enough, they were dismantled and re-erected on the Agger Valley Railway. In the case of the Derschlag station another source gives a different origin for the entrance building. An 1885 plan of the station indicates it was moved from Horst station (now in Gelsenkirchen) to Derschlag. Completion to the end of the First World War On 15 October 1884, the first train ran from Siegburg on the newly completed line to Ründeroth. It was initially frequented by only four pairs of trains. Protests led by local industrialists meant that the line was extended to Bergneustadt. The line came under direction of the railway division (Eisenbahndirektion) at Frankfurt in 1895 but almost all of it (from the 0.7 kilometer point) was transferred to the railway division at Elberfeld in 1897. In 1893, in the Volme Valley Railway was built branching from Dieringhausen to Gummersbach station at the same time the original Niedersessmar station was renamed Gummersbach, where it is actually located. In 1897, the Wiehl Valley Railway, which branched from Osberghausen towards Waldbröl, was completed, which meant that Osberghausen station became a marshaling point. Finally a line closing the gap to Olpe was approved in 1898. A height difference to the watershed to the Dörspe valley had to be overcome. The Wegeringhausen tunnel was also built nearby. The construction was problematic and its cost rose to nearly twice the estimate. It was completed on 11 February 1903. This newly built section of track was especially important for the villages between Bergneustadt and Olpe. These were previously connected by poorly maintained roads and trails and the area and had not even been connected by telegraph. Therefore, the population enthusiastically celebrated its completion for several hours, despite the long connecting times to Siegburg and Cologne. At the completion of the