Enter the red Itali in south west Estoria (just the same place where the rigged 4x4 placed). Get a call from some fanatic guy then drive to the subway station in Island Heights. Step on the platform, your objective is to ride on the rigged train. Enter the forthcoming one, do neither steal nor leave it until it blows up. After this you'll appear at the nearest hospital and will be called by the strange guy who will bring you his apologizes and admirations.