The phrase "train line" refers to a designated path or route on which trains travel. It represents a series of connected railway tracks that guide trains from one place to another. Full definition
Evidence shows that resources should first be focused on training line managers rather than just introducing wellbeing schemes such as providing fruit or implementing cycle to work schemes. (lawyer-monthly.com)
What's more — it could also allow further growth of stations below the ground, making it possible to build new train lines underneath the existing ones, to increase capacity even further. (treehugger.com)
Plus you want to be comfortable for what is sure to be a full day of wedding - related events, from the ceremony to the Soul Train line. (self.com)