KSRTC Railway Station Bus Stand is right opposite the Railway Station's main exit.
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NWKRTC (KSRTC), MSRTC (Konkan / nearby) and Kadamba (Goa) buses that depart from Central Bus Terminus halt here from where you can get quick connections to your onward destinations in KA/GA, MH and GA respectively.
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Time-table...
more... of Kadamba for various services to Goa is attached herewith.