This document describes Trafiklab.se, an initiative in Sweden that provides open public transport data and an infrastructure to support developers in creating innovative passenger information services. It aims to encourage developers both intrinsically, through challenges and learning opportunities, and extrinsically, through opportunities for career growth. The infrastructure includes APIs, documentation, and a feedback forum. Over 800 developers have participated in over 300 projects using the data. The initiative hopes to inspire more entrepreneurs by expanding the available data and APIs.