> But if the rail is a shipping channel replacement, no need to limit to one track. By this analogy, no need to limit to one port, either. But even this analo

> But if the rail is a shipping channel replacement, no need to limit to one track. By this analogy, no need to limit to one port, either. But even this analogy doesn't quite hold true, because tracks v. ports are apples v. oranges. The proper comparisons here would be tracks v. navigation routes and ports v. rail depots.