Mentioned in other threads is the long gone Marshall Square hobbies on Cermak near Marshall Blvd. A tiny little basement shop. There was a hand picture in the window, I assume operated by electric eye, when you put your hand over it a little train ran in a circle. The proprietors were kindly Rose and Grumpy Al.
BTW Al's Hobby's in Elmhurst closed last May after 67 years in business.