Amtrak, allies stump for passenger rail expansion By Andrew Carter - acarter@aimmediamidwest.com This map shows Amtrak’s proposed passenger rail service routes in Ohio. The Village of Crestline has been selected as one of the stops on the proposed 3C+D Corridor, which would provide service linking Cleveland, Columbus, Dayton, and Cincinnati. Amtrak COLUMBUS — Amtrak and its allies continue to marshal local and state support for the proposed 3C+D Corridor in Ohio while waiting for word about financial backing from the federal government. The proposed line would provide passenger rail service linking Cleveland, Columbus, Dayton, and Cincinnati with limited stops between the larger markets.