Why SM will be done at PM?
SM and PM both are different things
PM me repair vaghera b hota h aur coaches ko POH vaghera k ly bheja jata h
SM me bs Inspection hota h aur brake Inspection k ly pit me jati h agar uska single trip distance more than 2500 kms ka h for LHB..
Except...
more... rajdhani inpe distance pattern follow nhi hota inko pit me le k jata h even if distance is less for minimum 2-4 hours in pitline