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Gantry crane also called goliath crane, it is a kind of track travelling mid-heavy type crane, can be used where overhead runways are not practical, or in open areas where columns cannot be accommodated. The top main girder is mounted on two A shape columns which are further resting on wheel mounted end carriages.
link:https://www.kinocranes.sg/overhead-crane/25-ton-gantry-crane.html
25 Ton Gantry Crane | Kenancranes