Station Master, Stationmaster, Train Station Master, Train Stationmaster
noun
This word uses 長 in the same way as 社長, where it means something like "boss" or "manager." So, this 長 is the boss of the station, right? What do you call someone like that? You call them the stationmaster (that is, unless you want to be thrown to the trains).
えきちょう
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
今日は好きなアイドルがこの駅で一日駅長をしているんです。
Today, my favorite idol is serving as the stationmaster at this station for the day.
川田さんはここの駅長と親友なんです。
Kawada-san is a close friend of the stationmaster here.
えっ!あの駅長、元プロゴルファーだよね?
What?! That stationmaster used to be a professional golfer, right?