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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #II. Occupied territory #C. Rules of conduct with regard to property #(a) Public property - Art. 51.
Art. 51. Means of transportation (railways, boats, & c.), as well as land telegraphs and landing-cables, can only be appropriated to the use of the occupant. Their destruction is forbidden, unless it be demanded by military necessity. They are restored when peace is made in the condition in which they then are.