I would have to say my Grandfather & Father. My dad used to get his trains out and run them and then later on when I was in my teens, he started to get back into the hobby. Since his death back in 2001 I received all of his HO & N Scale trains. My Grandfather on the other hand was into a bigger scale, known as Live Steam. He has a layout in his back yard, PRR M1b #6750, and numerous rolling stock.