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Rail mounted ground rail gantry crane (RMG) is a kind of rail mounted crane used to offload, stack and load 20ft, 40ft, 45ft ISO standard containers. Its provision of power is offered by cable reel. The crane contains three mechanisms: hoisting, trolley travelling and gantry travelling.
link:https://www.kinocranes.sg/gantry-crane/gantry-crane-by-capacity/80-ton-gantry-crane.html
80 Ton Gantry Crane | Kenancranes