Thank you Mr. Cowford for "stepping up".
The article Mr. CN linked shows the tidal range in the Harbor to be 9m, or almost 30ft. That's a lot water moving in or out in six hours. As I recall from my Fairfield Navy Cadet days, the current is swiftest during the third and fourth hour of the flood or ebb.
But all this is apparently "moot" as the Port will remain, for rail transportation, at the mercy of the (States') FRA Class 2 trackage of the Irving roads (and that only until the "equity fund" chops up the MEC) or the circuitous CN.
Finally Mr. Newpy, I pray you know how much I respect the knowledge you bring to this discussion, but in this case I hope the outcome proves different from your report. Somehow, I think you hold same.