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Heeresfeldbahn
A ''Heeresfeldbahn'' is a German or Austrian military field railway (in Austria also called a ''Rollbahn''). They were field railways (''Feldbahnen'') designed for the military transportation purposes.
== History ==
As railways developed during the 19th century, the military also discovered the utility of this new mode of transport. In stark contrast to the rudimentary road network of the time, the railways could transport large quantities of supplies, heavy equipment and troops rapidly and efficiently. For operations to the front lines the military developed its own system of field railways (''Feldbahnen''), usually built to a narrow gauge. In addition to the general advantages of narrow gauge railways - they took up less space and could have tighter curves, for example - narrow gauge vehicles and track were more easily transportable and could be quickly moved to conform as the location of the front line changed.
Unlike road transportation, the establishment of a ''Heeresfeldbahn'' required the construction of expensive and time-consuming railway infrastructure (albeit of simpler design than conventional railways). They were built by specialist troops trained by the military, known as ''Eisenbahnpioniere''. As a war progressed prisoners of war were also employed. The ''Heeresfeldbahn'' is tied to this fixed infrastructure; under artillery bombardment or other acts of war it is not flexible enough compared with lorry transport. A ''Heeresfeldbahn'' can also be quickly captured and used by an army's opponents. This could become a major disadvantage if the army has to retreat and is unable to lift or destroy the railway quickly enough.
Due to these disadvantages, the ''Heeresfeldbahn'' completely lost its importance in the second half of the 20th century and was replaced by road vehicles which were now more technically advanced, cross-country capable and did not require specially trained crews. In particularly difficult terrain, air transportation is now also used (especially helicopters). The use of military railways is now largely restricted to internal transportation functions on large military sites, e.g. for transportation at munitions depots. In addition there are ''Feldbahnen'' on some military training areas e.g. large targets may be mounted on tipper trucks that are hauled by motorised locomotives as mobile targets for live firing exercises.
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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