This is really cool. I work on OpenTripPlanner at work and it’s neat to see this implementation of a “competing” open source routing engine. It seems like the scale at which this software runs is very different to OTP, but it still has some interesting features!
Nothing is more annoying when GTFS data provider quietly changes URL to new one, but keeps old one alive, although without updates. Also annoying when data updates just stop. That leads to many angry users.