If we turn now to the Sudan, we gain examples of military railways which, designed for the purposes of war, and constructed, in part, during the progress of active hostilities, first rendered great services in facilitating the conquest of a vast area, and then developed into a system of Government railways operated, in turn, for the purposes of peace, and accomplishing results as conspicuously successful in the latter direction as they had previously done in the former. During the time that Saïd Pasha was Viceroy of Egypt (1854-63) there was brought forward a scheme for the linking up of Egypt and the Sudan by means of a single line of railway from Cairo to Khartoum, with a branch to Massowa, on the Red Sea. It was an ambitious proposal, and, if it could have been carried into effect, the opening up of the Sudan to civilisation, by means of an iron road, might have altered the whole subsequent history of that much-suffering land. But the cost was regarded as prohibitive, and the scheme was abandoned for a time, to be revived, however, in a modified form in 1871, when Ismail Pasha was Khedive. It was then proposed that the line should start at Wady Halfa and be continued to Matemmeh (Shendy), situate about 100 miles north of Khartoum--a total distance of 558 miles. In 1875 a beginning was made with the building of this railway, which was to consist of a single line, with a gauge of 3 feet 6 inches, and was to be made with 50-lb. rails and 7-ft. sleepers; but when, in 1877, after an expenditure of about £400,000, the railway had been carried no farther than Sarras, thirty-three and a half miles from the starting-point, it was stopped for lack of funds. In the autumn of 1884 the British expedition to Khartoum, where General Gordon was endeavouring to maintain his position against the Mahdi's followers, was resolved upon, and it was then decided to extend the Sudan Railway beyond the point already reached, at Sarras, in order to facilitate still further the journey of the troops along the valley of the Nile, which had been selected as the route of the expedition. Platelaying for the extension was begun in September by a party of English and Egyptian infantry and native labourers, afterwards joined by the 4th Battalion Egyptian Army and the 8th (Railway) Company of the Royal Engineers. While, however, materials previously stored at Sarras were found to be still available, the trucks containing rails, etc., for the extension work had to be pushed by hand from Sarras to railhead owing to the absence of engines; sleepers were carried on the backs of camels, of which 300 were employed for the purpose, and the coolie work was entrusted to 700 native labourers, mainly old men and boys, most of whom had deserted by the end of October, when further platelaying was discontinued. By that time the extension works had reached the thirty-ninth mile, and the line from Sarras to this point was opened on December 4.