I'm building a Pennsylvania A3 switcher following Kozo Hiraoka's book but at a G scale. The reason is because I do not want to ride it, I'm just enjoying building it and it will end at a shelf. I want to say thank you to the author of the book because it is a fantastic book. This is a long term project (10 years?) because I am a 3 kids father, so you will see it takes loooong.