Explain more? If I am imagining this right, it sounds like it would play awful, so please explain more.
what he means is "push and pull". blu needs to push the neutral cart into red base, red the same cart into blu base. Its only 1 cart on 1 track, going back and forth
Actually there was one that I felt played okay, the koth type pretty sure the map was pl_gerbil. If you push the cart in to the enemy territory, then your timer goes down. 5 cp style tug of war, please no.
You'll have to ask gerbil http://forums.tf2maps.net/member.php?u=3187 just make sure you ask him it was his map first
Ive been thinking about it, and I think it would be easier, both to map, and for the entities, to just do a KoTH for the 72 hour contest!
What about a circle isntead of a straight line? Then at least a bigger part is used. For example: http://www.fpsbanana.com/maps/81450 pl_donut (For entities you can simply just decompile and take them as i made the map myself anyway and i dont realy care about people taking the entity work from it.) A circular system might work quite well combined with the koth system.