My grandfather build a 12' x 5' model train layout in his basement when I was very young and he lived just a few houses away so it was very easy for me to walk over to play, so I grew up with model trains.
Funny how often I would hear grandpa say...
"Steven, I hear your mother calling you... GO HOME"
(click on images to enlarge)
Here are a few of the black and white photos I have of his layout taken in '67 and '68 during the construction. If you look very closely you can see the small B&O steam switcher, several of the Mantua little blue hoppers, and his Mantua Burlington GP-20. These trains are still in my collection thirty years later.