The installation used realtime data (Google directions API): I somehow figured out, that if I would run this from a local machine and reset the browser frequently, Google would let me do this even without an API key… they certainly sensed something was awry and I did get API warnings and captchas because of 'suspicious traffic on my network', but they were nice enough not to block me completely. I strongly doubt this would still work though, this was in 2017.
Pictures and videos of the installation: https://maschinenzeitmaschine.de/derweil/