I got into a CSMT local from Kalyan at 12.40 pm as per my usual routine. The train reached Thane station without a hitch, but suddenly stopped as it approached Mulund. There were no announcements about why it had stopped.

The train stopped for a long time there, then kept moving for 30 seconds and stopping for 20 minutes or more. The pattern kept repeating till Vikhroli. Finally, an announcement was made advising people to not exit the train mid-journey as it could be dangerous. There was still no word on what had happened. Commuters were naturally getting restless.