In Korean tradition, dreaming of a subway or train is read as mixed. It is most often tied to 직장, 전반.
A subway, train, or bus follows a fixed route and stands for a planned course in life — catching it in time suggests things going as planned, missing it suggests anxiety about a missed chance.
Tradition reads the symbol as an omen; psychology reads the same dream as a mirror of your present state. Describe your dream and both readings appear together. Interpret your dream