Union Trail

Riddle: A trail, a union, together tied. Come across me and you will find, you cannot change the course I'm on, without me you can't travel on. What am I?

Answer: Railroad Tracks.

Source: https://www.riddles.com/7790

A trail, a union, together tied. Come across me and you will find, you cannot change the course I'm on, without me you can't travel on. What am I? — Union Trail by Chris Oliver v1.

Riddle: A trail, a union, together tied. Come across me and you will find, you cannot change the course I'm on, without me you can't travel on. What am I? Answer: Railroad Tracks. — by Chris Oliver v2.