Hi, Train Jam organizer here!
We do a lot of things just to keep the organization simple since a lot of the folks who come onto the train have never ridden a train before (let-alone a long distance Amtrak train, specifically), and many are traveling from abroad (so they aren't familiar with American trains at all). One of the major things I do is to just cap each room at 2 people. Doing this stops a lot of confusion for people in terms of pricing, space, ticket type, etc (both for the folks coming on the train AND for me keeping track of 342 people). We also use a combination of the tickets and sponsor money to cover all snacks in both (yep, two!) lounge cars, so pricing might look a bit strange to those of you who are used to Amtrak's regular pricing.
I know it's a little strange to have us take over an entire train once a year, but so many people who attend Train Jam get such a joy out of being able to travel across the country, see the amazing sights, and work with a diverse set of people from all over the world....all while doing the thing they love - creating games. We have people from almost every continent of the world who have never been to the US before, who get to immediately experience some of the absolute best scenery the US has to offer, and I really appreciate how much Amtrak has embraced us over the years to do such a weird thing in such an amazing place.
If you want a little taste of what Train Jam is like, here's an article that was written about us a few years ago (before we were big enough to take over the whole train), which I think really captures the spirit of why we do this every year:
https://www.polygon.com/features/2016/4/8/11376970/train-jam-2016
I'd love to answer any questions y'all might have about us!