When looking for examples of digital innovation, few of us would think of public transport. But it turns out the sector is a rich source of use cases for big data, open APIs and even artificial intelligence. In a major city like London or Paris, there are millions of travelers every day who need accurate, timely information about the current schedules of thousands of buses, trams and trains. Getting that information to them on their smartphones has taken a lot of foresight, creativity and graft over the years, and the innovation continues today. In one example launched in Britain last month, rail booking service Trainline has begun using AI to generate personalized alerts about travel disruption to users of its mobile app.