It might be kind of ambitious, but I think it would be cool to integrate a real, working transportation system into the maps. For example, there should always be large scale cities built around the ports. Tramp freighters should sail into port, be unloaded onto trains. Trains should go to the city's marshalling yard, and then from these yards travel out through the country to the other cities and towns. There could be two loops, one for clockwise travel and one for counterclockwise. Trains passing each other going in opposite directions would be pretty cool to see. To simulate going through a tunnel, maybe you could have a "despawn" point at the tunnel entrance, where each car disappears as it encounters the point on the track at the tunnel entrance..and each car respawns at the tunnel exit in the proper order, say 10 or 15 seconds later. It would appear like the train is travelling through the mountain.
Strategic bombing could then include ports, factories, refineries and RR marshalling yards at the cities - more than just knocking out the enemy's HQ and dropping their radar.
Interdiction could be dropping bridges, attacking trains and truck convoys, freighters at sea, etc.
What really might be wild is allow players to take control of the marshalling yard (the same way players can assume command of a CV group) an let them build trains and send them out from the marshalling yard to try to resupply the fuel, food, and other material to cities and towns in the country. Or maybe build a train of tanks on flatcars to deliver to a town next to a VH.
