expression, noun
path laid out for one; predetermined course
Idiomatic expression referring to a life or career path predetermined by others, such as parents or society, often with a nuance of lacking personal choice.
彼は親に敷かれたレールの上を歩いてきた。
He has walked the path laid out by his parents.
敷かれたレールから外れる勇気が必要だ。
You need the courage to stray from the predetermined path.