I’ve created a module for public transportation in Hamburg (Germany) which shows next trains/busses departing from your station. It’s using the HVV API with realtime data. Currently only train realtime data is working. It’s based on a modified version from Bangee’s SwissTransport module.
I guess it’s only of use for very few people, but I wanted to share it anyway 
It’s still BETA and the very first working version, please be patient
Find it on GitHub:
Also I added a small article on my blog on how to install and how to obtain an API key: https://lane6.de