How does the future for the world’s almost 300 electric trolley bus networks look like? In fact, many systems feature outdated vehicles and low service standards due to decade-long under investment and neglect. Do existing grid infrastructures support a quicker electrification by modern vehicle technology? Or are cities with trolley bus systems limited by a technology lock-in? Together with Adrian Kobayashi, director of planning at Solingen’s municipal transport operator, we’ll investigate the case of a city which not only decided to maintain its trolley bus systems but is making it fit for the future.