Joe,
I am a retired mechanical engineer who designed and performed design analysis calculations for bay cranes in tonnages from 50 to 350 tons from the late 1970's through the mid 1980's. The bay cranes we designed and built had triaxial motion. For reference , the bridge structure and drive equipment moves in the x-direction, the trolley and its drives moves in the y-direction(90 degrees to the x-direction) and the hoist in the z-direction( 90 degrees to the x-y plane of the trolley and bridge). The runway structure that you designed and build including the sway bracing is well conceived. I have built many of the Plastruct O Scale kits including the oil refinery and purchased component shapes(ABS or styrene) other structures or roof trusses for my IHC enginehouses. The oil refinery is very detailed and one must be able to read a print to build this kit, once completed, it adds a new detail to the layout. The bay crane seams to be the HO Cornerstone bridge crane kit. This is a good example where an HO structure can used on a O Scale or 3-Rail layout.
