@Tom Tee Great point with the oval. I planned on the foundation to be acrylic or plexiglass and I'm keeping it to a single track so I can make it as wide as need be to contain a derailment.
I've been cutting plexiglass recently and learning about cutting acrylic. Worst case is I bring the dimensions of the rounded cuts to a glass shop. I think I can use strong double stick tape or even glue to sequre the tracks to the clear foundation.
I picked up the train tonight! It's an MTH NJ Transit E8 Diesel Set
https://mthtrains.com/30-20437-1
Unfortunately I'm unable to find any passengers cars for it so I'm using Lionel NJ Transit cars from this set.
http://www.lionel.com/products...t-u36b-4167-6-30169/
I'm going to continue searching for the MTH ones but these will do for the time being.