at kafr el-zayyat the line between cairo and alexandria originally crossed the nile with an 80 feet (24 m) car float. this was the single largest project of the south street works. however, on 15 may 1858 a special train conveying sa'id's heir presumptive ahmad rifaat pasha fell off the float into the river and the prince was drowned. stephenson therefore replaced the car float with a swing bridge nearly long.