Here, again, the extreme rarefaction of the atmosphere is a serious disadvantage against which the engineers have had to contend, while the fluctuations in temperature are extremely great. A difference of 113 degrees in the course of a day is by no means uncommon. At noon the thermometer will stand at 100, by nightfall it has dropped to 0.13 degrees. Such a rise and fall are tremendous, for at Greenwich, it may be pointed out, the same daily fluctuation averages about 17 degrees.
Again, in the highest altitudes through which the line threads its way, water boils at 180 degrees, as compared with 212 degrees on the coast. In order to enable the workmen to prepare their food in such exposed, lofty situations, special vessels have had to be devised to prevent the water boiling over, for this result ensues long before the food is cooked properly, and the loss of water, even of only a pint, in such parched regions is a serious matter. In some places the country is as arid as the Sahara, and the water has had to be transported over great distances in barrels slung on the backs of mules. Large packs of these animals have been pressed into service for this work only. Similarly, the building material has had to be carried from the coast to the constructional camps strung out along the proposed route, by means of this ship of the Andes.
The work was carried out from both ends simultaneously, one tentacle being thrown out from the junction with the Bolivian State railways westwards, and the other eastwards from the coast. The cost of providing the capital of Bolivia with this direct outlet to the Pacific approximates £3,000,000, or $15,000,000. Bearing in mind the high cost of the other Andean railways, this last conquest of the South American mountain backbone may be considered low.
CHAPTER XXIII
A LITTLE-KNOWN CENTRAL AFRICAN RAILWAY
Buried in the heart of Central Africa, with one border skirting the most southern of the chain of Great African Lakes which nestle in the huge depressions of the continent, is a small, little-known British colony. This corner of the empire is Nyasaland, a tongue of promising territory which thrusts itself southward into Portuguese East Africa.
Though the wealth of this little territory, measuring 550 miles in length, and varying from 80 to 90 miles in width, is incalculable, exploitation of the resources has been handicapped by the complete absence of transportation facilities. The early pioneers and civilising influences visiting the country were impressed with the outlook, and sought to attract settlers. The more hardened and adventurous accepted the invitation, and, finding the country in every way as described, devoted their energies to the cultivation of coffee, which held out most promising inducements. The physical configuration of the country, providing a diversity of hill and dale and ample watering facilities, served to bring about a certain movement towards settlement. Roads were driven in all directions, and, indeed, the internal communication to-day leaves little to be desired.
But the country suffered severely from being cut off from the world at large. There is only one channel by which the country can be entered, and that is from Chinde on the coast, via the Zambesi River until the mouth of the Shiré River is gained, this latter waterway being followed so far as Port Herald. The distance is about 210 miles, and the stern-wheel, shallow-draught steamboats occupy from 4 to 6 days on the journey according to the state of the rivers. For about three months in the year the Shiré River can be navigated for a further 40 miles to Chinde, and occasionally Chikwawa, 310 miles from the coast, can be reached by water.
In the early days a hope was entertained that it would be possible to travel by water from the coast to Lake Nyasa, but this is impossible, as the Murchison Falls, which connect the Upper and Lower Shiré rivers, are an insurmountable obstacle. Had this navigation been possible, the country would have been provided with an excellent artery of communication, and would have brought Blantyre, the capital, into direct touch with the coast. As a matter of fact, however, the normal head of navigation on the Shiré River is Villa Bocage, in Portuguese territory, just above the point where the waterway joins the Zambesi.
In order to remedy this grave disability, which was hindering the expansion of the country to an acute degree, the British Central Africa Company decided to provide a main line of railway between Blantyre and Port Herald. The opportunities were unique, as transport was difficult and costly, while it was pointed out, also, that by means of the iron road the slave-trade around Lake Nyasa could be broken up effectively. Sir Bradford Leslie, K.C.I.E., M.INST.C.E., the eminent engineer whose bridge-building and other works are scattered throughout the Indian Empire, was approached to extend his valuable assistance and skill in the prosecution of the undertaking. The scheme was not ambitious so far as railways are concerned, but there were many peculiar difficulties which had to be overcome. The line promoted was only 114 miles in length, but in that distance a difference of 3,700 feet in levels had to be overcome. The broken character of the country proved that some heavy work would be necessary, for the deep, wide rifts in the mountain sides, though dry in summer, are raging torrents when the wet season breaks.