Hello, this is my first time visiting your forum and I am hoping you can point me in the right direction. I am a pastry chef/sugar artist who is building a model train out of cake! I am trying to find an online source to give me exact outside dimensions of a (preferably) O gauge train. I need the dimensions for an engine, a coal car, flatbed, and caboose. Real life dimensions would work, also, or if I have to go small HO scale. Can you help? Thank you-thank you-thank you!