I am trying to prevent railroad movement across a river. Can it be done? I put in the number of ships listed to blockade the river section but the trains appeared to pass right through the river blockade.
Then I noticed that the number of ships needed to blockade the river went up. First it said 4 ships. I put in 4 ships, then it said I needed 2 more. I have noticed this in trying to blockade ocean harbors as well. First stating you need x number of ships and then at some point, stating I need some more ships. Is this a bug or is it related to cohesion level of the ships or something?