a subway tunnel system. By opening up the tunnels for guided historical tours, the company could educate visitors and locals alike on the history of the abandoned project. The conceptual plan also ...

"The reality of having an abandoned subway tunnel that oh ... Why? It owns nearly 2 miles of buried concrete tunnel that was supposed to house Cincinnati's subway. Only a water main and ...

Cincinnati's never-utilized subway system is considered the nation's largest abandoned subway tunnel ... a 'specialized rail system' and thus its 2+ autonomy function is fully sufficient for ...