Along with Roger Melcior we’ve created Rodalia.info, a system to monitor real-time network status for the Cercanías Barcelona trains based on messages sent by users via Twitter.
Rodalia.info consists of a website to aggregate all information supplied by the users via Twitter and also the information provided by Transmet, a version of the web adapted to mobile terminals and Twitter accounts to follow directly the tweets of each line.
More information about the project and how to collaborate: