The Valparaiso and Santiago Railway: the Maquis Viaduct, 1864. Engraving from a drawing by Mr. Boulet, of '...one of the highest railways in the world... Its length is somewhat over 114 miles, and, as its course lies through a portion of the Chain of the Andes, it offers, in some respects, features seldom encountered upon works of this nature...at one point occurs the Maquis Viaduct, an iron structure 126 ft. in altitude, 600 ft. in length, and which presents the rare features of being curved to a radius of 600 ft., and, on account of the incline over it, of being about 14 ft. higher at one en