When Walt Disney added a train to his Holmby Hills estate, it wasn't just a dry run for DISNEYLAND or a place to satisfy his passion for trains (Though it was those things too.) As it turned out, Walt was concerned about his daughters since he was often busy at the studio.
So he wanted to build a wonderful backyard that would become the center of the neighborhood; a place where their friends would want to hang out. (That way it would be easier to keep an eye on them.) In addition to the train and barn, there was a soda fountain, private ice cream parlor and a place where the girls could entertain their friends. It would create wonderful memories and serve as a test run for a bigger project that he would eventually share with the world.