This is the 4482nd most frequent Japanese word.
始発
"始発" means "first train" or "first departure."
Here, '始発' describes the very first scheduled train service of the day.
私は毎朝始発電車に乗って通勤しています。
I commute to work every morning by taking the first train of the day.
In this sentence, '始発駅' refers to the station where a train journey begins.
始発駅から目的地まで直通の電車を見つけました。
I found a direct train from the starting station to my destination.
Here, '始発' is utilized to indicate the earliest scheduled bus service available.