Friends went today with 2.5 yo , dd and DS they loved it!
I'm one of the friends who went today, and can't compare it to previous ones bc it was a first, but my DS loved it, he was in complete awe the whole time, our little friend (girl) was far more into it, but they both had such a great day.
Seating is however you choose, children on floor at front, adults can also sit on floor but towards the back, and plenty of chairs to spare, plenty of room really.
Had a great day but that could also be bc DS had his first train trip too! It was a big day of firsts