My train room is in my basement. My basement is the full foundation of the home and is 72 feet long and 30 feet wide. One end has a walk out with two windows and a patio door going out to a deck. I have walled off 25 feet of this end and finished it as a man cave/train room. The remainder of the basement is typical with a large workcenter for repairing and restoring trains and a large woodworking facility plus the usual utilities such as furnace, water heater and water tank from the incoming well. Also, most important, my beer refrigerator.
I use a dehumidifier in each area. At present I have (2) Keystone dehumidifiers model KSTAD70B. I will be cranking them up in the next couple of weeks for their fourth season. So far they have worked very well. They are both hooked to drains so I don’t have to worry about emptying the tanks. I try to keep my basement at about 40%.
Jim