Hi Murliji,
Thanks..
For everyone.. Vasai is only a tech halt and you can't book tickets to or from BSR. Although, I've seen people boarding this train in unreserved at Vasai. These folks seem to know where will this train be made to wait for overtake. But, this is illegal and if one is caught, will be fined! As per rules, one can board n alight only at commercial halts. I may be corrected..