There is a prototype;
I took this in Williams, AZ in June 2006 after returning from the Grand Canyon Roger
Roger,
I have found there is a protoype for almost anything.
I have videos of an SP cab forward on the point in front of SP PA’s helping up Donner Pass.
Found this photo from a few years ago when a friend stopped by.
(http://freightsheds.largescalecentral.com/users/phillipsmk/_forumfiles/Side_by_side.jpg)
