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Crane (rail)
A railroad crane, (US: crane car or wrecker; UK: breakdown crane) is a type of crane used on a railroad for one of three primary uses: freight handling in goods yards, permanent way (PW) maintenance, and accident recovery work. Although the design differs according to the type of work, the basic configuration is similar in all cases: a rotating crane body is mounted on a sturdy chassis fitted with flanged wheels. The body supports the jib (UK; US: boom) and provides all the lifting and operating mechanisms; on larger cranes, an operator's cabin is usually provided. The chassis is fitted with buffing (UK) and/or coupling gear to allow the crane to be moved by a locomotive, although many are also self-propelled to allow limited movement about a work site.
For cranes with a jib that extends beyond the length of the chassis, a idler car (also known as a 'jib carrier' (UK) or 'boom car' (US)) is provided to protect the jib and to allow the crane to be coupled within a train. The idler car is usually a long, flat wagon (i.e. a flatcar) that provides a means of securing the jib for transportation; storage areas for special equipment or supplies are usually fitted too. It was not uncommon for the idler car to be built on a withdrawn revenue-earning wagon.
==Usage==
Railroad cranes are usually designed specifically for one of three purposes:
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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