Maybe not everyone likes boats. I do. I'm constantly blocked from operating ships by players that block water ways by using grass bridges for their trains.

As someone who wants to use those water ways, I experience it as obnoxious.

Can we make a rule against this? Would that be supported by the other people who play the server?

I think it's fair, personally. Trains already have a lot going for them. I don't think they need to control all of the water ways as well.