The most recent commit was in Sept' 2018, and the primary author of RailCar is Vish who jumped to Heroku (SalesForce) in Nov' 2018. I'd speculate that this is

The most recent commit was in Sept' 2018, and the primary author of RailCar is Vish who jumped to Heroku (SalesForce) in Nov' 2018. I'd speculate that this is related.. either this was a pet project for Vish and died when he left, or he left because the project was frozen. Either way, the project seems dead.