Bliksem Labs has put quite some effort in designing a container format which can host public transport schedules dubbed: timetable.dat. The format is binary and uses lossy compression techniques which matches with rrrr, their routing engine. Opposed to text-based formats such as GTFS or NeTEx, it is not easy to review by the human eye. TimetableBrowser is an OS-X application build by First Flamingo Enterprise B.V. for browsing through timetable.dat.
Compiling from source
Create a location where you want to host your files.
mkdir TimetableBrowser; cd TimetableBrowser
Checkout this repository:
git clone https://github.com/firstflamingo/TimetableBrowser
Checkout the rrrr_cocoa_wrapper:
git clone https://github.com/firstflamingo/rrrr_cocoa_wrapper
Checkout the rrrr ansi branch:
git clone -b ansi http://github.com/bliksemlabs/rrrr
You can now open TimetableBrowser.xcodeproj in Xcode, and are ready to go.