Best and the fastest train if one wants to reach Una or Diu from Mumbai. One should get down at Savar Kundla station. At 6:15 a bus to Una comes at the railway station gate to carry passengers. This bus takes a long route to Una. Hence, One can get down at Khambha and take another bus to Una.
So you don't have to take rikshaw to get at the bus stand as the bus arrives at the station gate itself.
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If the train is late and reaches after 6:15 then take a sharing auto 10 rs per person to gsrtc station.