Hi Alex, very nice work bench. You got me thinking when I saw your table saw parked under the bench. I have an radial arm saw but I have to keep it in the shed because of it's size and it is a little work to set up when I need to do large projects. I think I have a possible home for a roll away eight inch saw for smaller jobs.
As for the train room it's going to be great watching it grow. You have about ten feet more length then mien and a foot extra in width so I consider your room "Green Acres".
Have Fun!