Hi Cody,
I really hope you're able to attend the train show tomorrow. They are always a fun time for me. It will be exciting for you but take your time, breathe, and take it all in! It sounds like you're looking for what may be an uncommon product. Don't be disappointed if you don't find exactly what you're looking for. Half the fun is in just looking at the wide variety of trains for sale, and the operating layouts. Take some time to talk to the sellers. They are likely model train collectors or operators and like us on the forum, they like to talk about trains. If they don't have what you're looking for, ask if they have anything like it at home or if they know if any other sellers might have that item. But remember, they are there to sell trains so don't take up all their time if there are other buyers wanting to talk to them.
I hope you get to go because I know you'll have fun. It can occasionally get crowded and noisy during peak hours but most outfits will let you leave to go outside and take a break if necessary. Just make sure you can get back in. Most places will have a hand stamp for paid admissions. People often buy so much stuff that they need to go back to their car and drop off their purchases.
John