<https://www.porttechnology.org/technical-papers/stack-operations-in-an-intermodal-rail-terminal-using-rtgs/#webpage>
<http://schema.org/description>
"Traditionally on the North American Railroads Rubber Tired Gantry (RTG) cranes are used to load and unload trains. In addition, the chassis used for"
<https://www.porttechnology.org/technical-papers/stack-operations-in-an-intermodal-rail-terminal-using-rtgs/>