Well, this is a musical comedy, so, the plot points and devices shouldn't be poked at too hard, else they'll tear, but, I figured that they must have had enough of a layover in NYC for Phil to run right across 7 Av., over to Macy's or Gimbel's or very possibly find a vendor right there in the Penn Station arcade that would sell him the electric blanket, long underwear and Nanook of the North outerwear.
The train from Florida was Bob and Phil's way of getting to NYC. Phil gave the girls his and Bob's tickets. I'm assuming they had to change trains in NYC to get to Vermont. We are shown an indication suggesting this by the two different trains shown between the Club Car "Snow" musical number scene and their arrival in Pine Tree, Vt.
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