Here is my 8 wide Bethgon Coalporter, a rotary dump hopper. Sometimes referred to as a bathtub hopper, this unique design not only dramatically increases the payload capacity, but since it is constructed of aluminum, it is lighter and therefore allows for larger loads to be hauled for the same horsepower.
Another view along with a prototype for comparison here
And another pic showing a Soo EMD 1200 hauling a string of Bethgons here
Wow! I saw this model in person at BricksWest, and it definitely gives 8-wide builders something to aspire to in terms of detail and scale. John spares no expense with his models, which turn out beautifully.