Mechanical folding crane

A crane, can also be known as a bridge crane, overhead crane is a type of machine used for lifting, generally equipped with a hoist (device) or winder (also called a wire rope drum), wire ropes or chains and sheaves, that can be used both to lift and lower materials and to move them horizontally. It uses one or more simple machines like a hoist to create mechanical advantage and thus move loads beyond the normal capability of a human. Cranes are commonly employed in the transport industry for the loading and unloading of freight, in the construction industry for the movement of materials and in the manufacturing industry for the assembling of heavy equipment.

Rail Crane
For more details on this topic, see Crane (railroad).
A railroad crane has flanged wheels for use on railroads. The simplest form is a crane mounted on a flatcar. More capable devices are purpose-built.
Different types of crane are used for maintenance work, recovery operations and freight loading in goods yards.

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