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A GTFS feed is composed of a series of text files collected in a ZIP file. Each file models a particular aspect of transit information: stops, routes, trips, and other schedule data. The details of each file are defined in the GTFS reference.
GTFS Spezification: https://developers.google.com/transit/gtfs/reference/
sudo pip install transitfeed
Or get the trunk from
svn co https://github.com/google/transitfeed.git/trunk
Comes with some command line tools
Use transitfeeds feedvalidator.py on a zip file to obtain a detailed report on the data quality. Loading in Java