The road now passes two snow capped volcanoes, from one of which smoke may be rising, and crosses a stream of lava one-third of a mile wide and several miles long, to the summit of the main line, 13,000 feet. Soon after, a borax lake belonging to a British company may be seen; 24 miles long, it is the largest single deposit in the world and the chief source of the world’s supply. At Ollague, where snow storms occasionally impede traffic, is a branch to the rich copper mines at Collahuasi. The Bolivian frontier is soon afterward crossed, and at Uyuni a change is made to the broader gauge line to La Paz. The =Trans-Andine Railway=. Of all the railroads of Chile, the Trans-Andine is naturally the most famous, as a part of the only trans-continental railway south of Panama; but financially, as yet it is hardly a success. With post-war increase of traffic, there will doubtless be an improvement. The Trans-Andine section of metre gauge begins at Los Andes, altitude 2723 feet, 88 miles from Valparaiso. A change is here made from the State Line, 5.5-foot gauge. It is a distance of 43 miles to the tunnel, a steep climb up the Aconcagua River Valley, with a maximum grade of 8 per cent; 20 miles of rack railway are employed. There are 25 tunnels, and on the Aconcagua River or its branches, 118 bridges. The scenery is wild and the journey delightful. Sheds have been erected against snow and land slides. Up to 1916 the road was closed for several months each winter; but with an increase of sheds and with a force of men continually digging, the road was kept open through the years 1916, ’17 and ’18; it was seriously blocked in July, 1919. While previously passenger traffic was the more remunerative, in 1916 unusual efforts were made for the benefit of important freight which it was impossible to ship by sea. The tunnel is at a height of 10,486 feet, its length is 10,385 feet, each practically two miles. The boundary line is near the middle, each country building to that point; but the whole is operated as one line from Los Andes to Mendoza. The line was opened in the Centennial year, April 16, 1910, in time for the Exposition at Buenos Aires. The cost of the Chilian section was about $15,000,000. Operation is at a loss, interest being paid by the Government. The capitalization is $317,000 a mile. Fifteen Trans-Andine projects have been put forward, most of them for the south, one from near Puerto Montt. One in construction is from Talcahuano to Bahia Blanca by way of Temuco. A road from Punta Arenas to the Loreto coal fields is the most southern railway in the world, as that is the most southern city. The early construction is expected of an important road at the north from Salta in Argentina by Huaytiquina on the border to Antofagasta. Of wagon roads there are said to be 20,000 miles. The Arica-La Paz Railway is described on page 222. CHAPTER XXXII CHILE: RESOURCES AND INDUSTRIES