Devil's Advocate
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I've traveled with Amtrak on several holidays including Thanksgiving, Xmas, and New Years. Other than the discontinued holiday meal that wasn't specific to any given day it's generally been roughly the same experience as any other trip. Which is pretty much the same thing as you find when flying on a holiday. Occasionally there's an elf hat or a light string or some garland taped to the wall/ceiling but that's about it. I think most people are just trying to get where they're going. I've seen this and similar questions asked many times but I'm not sure where the idea of a "holiday party train" comes from. It must have been before my time or in another part of the country/world.