Adds massive cargo ships to the game, that function similarly to trains. Also adds tanker ships, train bridges. NOTE: In 2.1, You Must Install Oil Rigs Separately!
I would also like battleships. I've gone across the ocean only to encounter a shoreline that was simply too crowded to land on. But I'm not sure how you would make work reasonably well with biters not being able to rush the battleship. :-/