Railway announced a $100 million Series B funding round Thursday, positioning itself as an alternative to Amazon Web Services and Microsoft Azure for developers deploying AI applications. The San Francisco-based platform has quietly built a user base of two million developers and is now leveraging the surge in demand for AI infrastructure to challenge incumbents that were designed for traditional workloads. The funding signals investor confidence that there's genuine market opportunity in rethinking cloud infrastructure from the ground up for the AI era, rather than retrofitting existing platforms.