Railway variables can reference other variables within the same service, Railway provided variables (prefixed with RAILWAY_ ), and variables in other services. With a few minor tweaks to the template button composer, you can now specify everything you need to deploy database templates, including a Docker image as the service source, the TCP port to proxy to, and the mount path of a volume. Our plugins UIs will also work seamlessly with deployed database templates in the “Data” tab of the service.