I wonder how/where the author gets connection time information. Each country, and sometimes each public transport company, seems to have their own system, sometimes hard to access digitally.

I've been building a mobile app for quick and convenient public transport departure lookup in Switzerland[0], which is doable because there's a free, well-documented public API[1]. Since it's fairly popular, I thought about extending it to other countries, but as mentioned above, the API landscape looks super heterogenous and spotty.

[0]: http://billhillapps.com/billhill/quickov.html [1]: http://transport.opendata.ch/