Hi @karussell,
I removed the short_fastest weighting and other some parameters.
Here is my new request: /route?vehicle=pt&point=42.4417419%2C-76.5109827&point=42.4554466%2C-76.4896513&points_encoded=false&pt.arrive_by=false&pt.walk_speed=3&pt.earliest_departure_time=2018-03-26T03%3A21%3A52.000Z
It’s arguable whether this should look like an error message though. In regular (road-network) GraphHopper, it is indeed something like an exception or error (the road network is mostly connected, except if you do very unlikely things like driving intercontinentally).
In public transit with its hard constraints, it should rather just be an empty result set.