first departure of the day; first train/bus
Refers to the earliest scheduled departure of a train, bus, or similar service on a given day. Often used in timetables and travel contexts.
See also: 終発
I'll go to Tokyo on the first train tomorrow.
The first departure is at 5 a.m.
departing from the starting station
Describes a train or bus that begins its route at the current station, as opposed to one that is already in service. Common in phrases like 始発駅 (starting station) or 始発電車 (train starting from here).
See also: 終着
This train departs from this station (as the starting point).
You have a higher chance of getting a seat at the starting station.
I woke up early to catch the first train.
This is a train that starts from Shinjuku.
I waited at the station for the first train.
The first train from this station departs at five.