In april 2018, I participated in a hackathon organised by the public transport company of Brussels. (STIB)
We where a team of around 6 participants, and won the price! 🙂
Our concept was an AR-application where the user could see the metros ride in realtime under their feet. Using the realtime metro information provided, and the static information of metro routes.
The article can be read on their official website (French)