I don't think it needs to be dedicated indoor space - at least in my bubble, it's not uncommon to do temporary layouts on floors. It's obviously very focused on

I don't think it needs to be dedicated indoor space - at least in my bubble, it's not uncommon to do temporary layouts on floors. It's obviously very focused on the railroad part, but turning your apartment into a model railroad for a few days every once in a while means you can use a lot more space. Outdoor spaces can be used as well.