Hajimari no Yakou Ressha

From MangaHelpers:
A strange young girl lives in the old, forgotten Kisaragi rail station. She sees humans go by on the train, and she wishes she could speak with them. When one man accidentally stops and talks with her, the conclusion of his story becomes the trigger that sends her off on a journey of her own. She becomes a train conductor and heads off in search of her home, but she meets others with their own troubles along the way.