We went
P : along the railway line
Q : and had a right to
R : where other people not allowed to go
S : but daddy belonged to the railway

The Proper sequence should be:

A. RPQS

B. PRSQ

C. RSQP

D. PRQS

Answer: Option B

Solution(By Examveda Team)

We went along the railway line where other people not allowed to go but daddy belonged to the railway and had a right to.