Despite its practical potential, the current adoption of Digital Twins (DT) in the transportation domain and especially in Public Transportation (PT) is relatively slow. A significant barrier is the substantial effort and investment in resources required during the development phase, especially for informative visualizations, thus limiting its accessibility to PT agencies. The study proposes an automated development pipeline of DTs for PT, which uses Open Source software and data that make it easy to access and extend. We demonstrate the functionality of the pipeline using a scenario in Kista, Stockholm and discuss the potentials and limitations of DTs for practical use cases from a conceptual perspective.