A railroad department is founded in 1889. The first mine locomotives are delivered. Even today, the former factory premises in Ackerstraße are connected to those in Brunnenstraße by a tunnel. In this tunnel, the “first subway railroad in Germany” shuttled back and forth between one factory and the other, facilitating the transportation of people and materials between individual factory buildings. With a length of 270 m and a height of 3.15 m, the 2.6 m wide underground tunnel was a remarkable structure. Unnoticed by passers-by above, the electric locomotive whirred 6.5 m under Hussitenstrasse with materials and factory employees from one side to the other and back again. As enthusiastic about technology as he was, Kaiser Wilhelm II did not hesitate for a moment to take a ride on the AEG subway train to see the new technology for himself. AEG played a decisive role in the further development of electric rail operations and saw the electric connecting lines as one of the most influential means of transportation of the future.