Fairlie - a famous historic locomotive Robert Fairlie was a Scotsman who took out a patent for his design of double ended articulated engine in 1863. This type of locomotive is essentially two joined back to back sharing a common firebox and controls in a central cab. The power bogies pivot underneath both boilers.
The object You can rigged it, because it has 2 child-objects (Bogie_left and Bogie_right). These Bogie objects for their part contain the following objects: Respectively 4 wheels, the bogie-chassis and respectively 3 drive arms each side. (6 each bogie)