Catching Hussain sagar at kalyan from Borivali with a travel time of 2 hours: Borivali to andheri local slow or fast-15 min, not much rush at 8.50 pm, go out east side to enter Metro station. Take 20 rs ticket to Ghatkopar-15 min ride with frequency every 10 min. Go down the stairs at Ghatkopar metro station to directly platform 3 to get Fast local to kalyan-36 min, if u have time go to platform 1 for slow local - 56 min. DOnt mind the local ticket if you have ticket from cstm to hyderabad. Only be careful about the rush not peak though. Do not choose this route if you have luggage, single bag can be manageable. this way no need to go to cstm to catch ussain sagar