Corey I would hate to disappoint you but a don’t think there is a big enough place when it comes to O Gauge Trains. I have a 40x18 layout under construction and it is not big enough.
I think this is a really good point and probably instructive for Corey and others, myself included. I was born in 1964 and don't remember the early diesel era let alone the steam era, but in the modern era of REAL freight trains, they seem to go on for miles with dozens or hundreds of cars. My mainlines are about 80' long, so I could possibly fit 70-100 cars on a train if the locomotive's nose butted up against the caboose! Even if my mainline was twice as long, a train would still take up half the mainline.
Then there's the motor size. I've never doubleheaded because I haven't needed to, but I'm guessing one would need 3-4 engines, all powered, to pull a 100-car consist.
My factors may be totally off, but regardless, it's REALLY hard for any of us to model the real world in O gauge whether it be in a living room like Corey or a full basement like others.