This conference talk explores how to build modern platform services in the railway industry, focusing on BaneNOR's experience balancing cutting-edge technology with legacy systems. Learn how train companies approach platform engineering for critical systems that millions rely on daily. Roberth Strand and Manfred Bjørlin from Sopra Steria share strategic technical and sociotechnical decisions, common challenges, pitfalls to avoid, and easy wins when implementing platform engineering in a 200-year-old industry. Discover how BaneNOR manages various platforms (application, data, integration) while supporting developers, keeping stakeholders informed, and maintaining security and compliance in an evolving technological landscape.