A voice skill that we have built using the Google Actions Console. This skill aims to give users quick access to real-time train information in D.C. We have also built a similar skill on the Alexa Skill Console. Check this repository out if you are planning to build your skill on their console, or if you are comparing the two platforms.
For fundamental concepts (such as intents, scenes or types) of building an interactive model on the Actions Console, see this Google documentation.