Not only have the Rocky Mountains turned out to be passable, but the engineers have found themselves compelled to decide on the conflicting claims of passes without number. Wall-like and frowning as the Rocky Mountains are when seen from the plains, the rolling gaps are many, and they are easier crossed by railway lines than the less lofty chains of Europe. From the heat of the country, the snow-line lies high; the chosen pass is in the latitude of Constantinople or Oporto. The dryness of the air of the center of a vast continent prevents the fall of heavy snows or rains in winter. At eight or nine thousand feet above the sea, in the Black Hills, or Eastern Piedmont, the drivers on the Pacific line will have slighter snow-drifts to encounter than their brothers on the Grand Trunk or the Camden and Amboy at the sea-level. On the other hand, fuel and water are scarce, and there is an endless succession of smaller snowy chains which have to be crossed, upon the Grand Plateau or basin of the Great Salt Lake. Whatever the difficulties, in 1870 the line will be an accomplished fact. In the act creating the Pacific Railroad Company, passed in 1862, the company were bound to complete their line at the rate of a hundred miles a year. They are completing it at more than three times that rate. When the act is examined, it ceases to be strange that the road should be pushed with extraordinary energy and speed, so numerous are the baits offered to the companies to hasten its completion. Money is to be advanced them; land is to be given them for every mile they finish--on a generous scale while the line is on the plains, on three times the scale when it reaches the most rugged tracts. These grants alone are estimated at twenty millions of acres. Besides the alternate sections, a width of four hundred feet, with additional room for works and stations, is granted for the line. The California Company is tempted by similar offers to a race with the Union Pacific, and each company is struggling to lay the most miles and get the most land upon the great basin. It is the interest of the Eastern Company that the junction should be as far as possible to the west; of the Western, that it should be as far as possible to the east. The result is an average laying of three, and an occasional construction of four, miles a day. If we look to the progress at both ends, we find as much sometimes laid in a day as a bullock train could travel. So fast do the headquarters “cities” keep moving forward, that at the Californian end the superintendent wished me to believe that whenever his chickens heard a wagon pass, they threw themselves upon their backs, and held up their legs, that they might be tied and thrown into the cart for a fresh move. “They are true birds of passage,” he said.