The police detained seven commuters at Kalwa carshed on Friday morning after rail users could not board their regular train, which has now been replaced with an AC local. The protest also delayed the air-conditioned train. 

It is an age-old practice by commuters to board an empty local starting its journey from Kalwa carshed to Mumbai CSMT. When regular commuters can get it at Thane station, they find it already full.