Meanwhile, other preparations were put in hand for carrying the defensive line further to the east. The construction was commenced of a broad gauge of railway from Kantara eastwards across the desert. This railway eventually became the trunk line between Egypt and Palestine. In the days of trench warfare before Gaza, it transported freight trains heavily laden with rations and ammunitions, troop trains conveying officers and men in open trucks, hospital trains evacuating sick and wounded, and an all-sleeping-car express running nightly in each direction. In 1918, a swing-bridge was improvised across the Suez Canal, and Jerusalem and Cairo were then connected by rail without change of carriage being necessary. The future prospects of this railway seem unbounded. It will undoubtedly be continued through to Damascus and Aleppo, where it will connect with railways to Constantinople and to Baghdad and the Persian Gulf. Thus it will form part of a grand trunk railway system along the old caravan routes connecting the three continents of Europe, Asia, and Africa. In its conception, it was just a military railway, laid, with but little preparation, across the sands of the desert. To this railway, however, was largely due the success of the campaign that we are about to consider. We have already seen that the Sinaitic Desert is almost waterless. Although it has often been crossed by invading armies in both directions, the provision of water has always presented the greatest difficulty. The carriage of water in tanks upon the backs of camels, a method used by us for locally supplying troops between water dumps and the headquarters of units, proved successful here thousands of years ago. The plan adopted by the Turks of dragging water-holding pontoons across the desert was not to be despised. Further progress was made when supplies of water were transported in tank-trucks along the railway. But a bolder adaptation of modern science to desert fighting was reached, when it was decided to lay on a piped supply of water from the Nile.