When I first saw Brickshelf user "gcarstensen 's" newest steam engine, I immediately thought it was too large to be in scale with standard 6 or 8 wide LEGO locomotives. However, I now believe myself to be dead wrong. There is, in fact, a giant standard gauge Shay known as Western Maryland #6 , or "Big 6" to her friends. Big 6 was the lagest Shay ever built, and gcarstensen's model is a dead ringer for her.
I've been considering building a shay for quite some time, so I tend to study them very carefully. As yet I've not figured out if she can handle LEGO curves, but even so, there are a lot of great details to see. From her pistons to her cheese-slope boiler, this is a great MOC.