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Description
For transfer_type = 1 the documentation states: Timed transfer point between two routes. The departing vehicle is expected to wait for the arriving one and leave sufficient time for a rider to transfer between routes.
That having said; shouldn't the from_route_id and to_route_id not being conditionally required (instead of optional)? Something like: optional if from_trip_id (or to_trip_id) is specified.
I am missing the situation where *_route_id would be required.