From Buenos Aires to Mendoza, a distance of six hundred and fifty-five miles, this road is built on the broad gauge plan. At Mendoza a change is made to the narrow gauge railway, known as the Trasandino Argentino, with tracks of one meter (3.28 feet) width. The scenery on this line is very beautiful as it winds around bends, passes through tunnels and continues to climb up the passes of the Andes. In several sections on this side, as well as on the Chilean side, where the grade is over 2½ per cent., the Abt system of cogs and racks is used to assist the engine on the steep climbs. On the way the famous natural bridge, known as the Bridge of the Incas, is passed, and a hotel has now been built there by the railroad company. The Trasandino Argentino ends at Las Cuevas, which is the beginning of the tunnel on that side of the “cumbre.” Las Cuevas is 10,468 feet above sea level. The tunnel, which passes almost directly underneath the “Christ of the Andes,” is 10,385 feet in length, of which a little more than half is on the Argentina side, which is just a few feet less than the altitude above the sea. The Chilean terminus of the tunnel is at Caracoles, which is nothing more than a camp for labourers, and is a few hundred feet higher than Las Cuevas. From here another railroad of meter gauge, called the Trasandino Chileno, carries the traveller to the station of Los Andes, a distance of forty-five miles. It has been found necessary to construct snow sheds in many places in order to protect the track from snow slides, which are likely to occur in August and September. From Los Andes to Valparaiso the route is over the state railroad of Chile, which is of standard gauge (4 feet 8½ inches), and passes through some rich and fertile valleys on its way towards the Pacific.