As per Press Released by Western Railway Jumbo Block between Andheri and Mahim on This Sunday 8 October
A Jumbo block will be taken from 10.35 hrs to 15.35 hrs on Sunday, 8th October, 2017 on Up & Down Harbour lines between Andheri and Mahim stations for maintenance of track, signaling and overhead equipments. During the block, all Andheri trains which are run on Harbour lines will remain cancelled.
Detailed information to this effect is available with concerned Station Masters.
Why Block Needed Railway Because of Major track maintenance like track renewal for a stretch, new bridges or other permanent structures which need to be replaced or renewed on the existing track cannot be done while trains are running, as it will affect the safety of passengers. When these activities are done, the machines and men require Railway line occupation and hence trains will have to be blocked in that section for that period.
Passengers are requested to take note of the above arrangements.