1.
first train, first bus
The first train or bus of the day on a particular route.
2.
starting station, originating station
The station where a train or bus begins its route.
Related Words
Antonym:
終電 (last train)
Related:
終発 (last departure)
Antonym:
終点 (terminal station)
Related:
通勤電車 (commuter train)