If you are travelling from Marine Lines station to borivali, and are going by the fast train, you need to be on platform number 3. If you wish to go by the slow train, you will get the train from platform number 1.
If you decide to get off on any station before Borivali like Goregaon or Malad, it is important you know where the platform will come – left side or right side, so you can stand accordingly. Here is an article which we had written earlier about platforms on the western line.

