I am not sure about the BIRG tickets, but you can always purchase tickets on thes spot, which is the way I like to do it in case you want to change your plans due to weather, opportunity or whatever.
Always leave plenty of time on your treturn train for delays or other situations. While delays are not common, they can happen and if you are scheduled so tightly that a delay would cause you to miss the ship, take an earlier trin.
Just my opinion.
Tom
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