It is estimated that the 2870 miles of railroads finished in New England have cost $132,000,000,—which gives an average of nearly $46,000 per mile. In the Middle States, where the natural obstacles are somewhat less, the average expense per mile of the railroads already built is not far from $40,000. Those now in course of completion—as the Baltimore & Ohio Railroad, Pennsylvania Central, and other lines, the routes of which cross the Alleghany range of mountains—will probably require a larger proportionate outlay, owing to the heavy expense of grading, bridging, and tunnelling. In those States where land has become exceedingly valuable, the cost of extinguishing private titles to the real estate requires, and the damages to property along the routes form, a heavy item in the account of general expenses of building railroads. In the South and West the case is reversed: there the proprietors along the proposed line of a road are often willing and anxious to give as much land as may be needed for its purposes, and accord many other advantages in order to secure its location through or in the vicinity of their possessions. In the States lying in the valleys of the Ohio and Mississippi the cost of grading, also, is much less than at the eastward. Where the country is wooded, the timber can be obtained at the mere cost of removing it from the track; and through prairie districts Nature seems to have prepared the way for these structures by removing every obstacle from the surface; while fine quarries of stone are to be found in almost every region. These favorable circumstances render the estimate of $20,000 per mile in all the new States safe and reliable.

The primary design of nearly all the great lines of railway in the United States has been to connect the sea-coast with the distant interior, to effect which object it was necessary to cross the Alleghanies, which intersect every line of travel diverging to the West from the great commercial cities of the seaboard.

The Eighth Census (1860), continuing the line, makes this addition to that of the Seventh:—

Previous to the commencement of the last decade, only one line of railroad has been completed between tide-water and the great interior basins of the country, the products of which now perform so important a part in our internal and foreign commerce. Even this line, formed by the several links that now compose the New York Central Road, was restricted in the carriage of freight except on the payment of canal tolls in addition to other charges for transportation, which restriction amounted to a virtual prohibition. The commerce resulting from our railroads consequently has been, with comparatively slight exceptions, a creation of the last decade.

The line next opened, and connecting the Western system of lakes and rivers with tide-water, was that extending from Boston to Ogdensburg, composed of distinct links, the last of which was completed during 1850. The third was the New York & Erie, which was opened on the 22d of April, 1851. The fourth in geographical order was the Pennsylvania, which was completed in 1852, although its mountain division was not opened till 1854. Previous to this time its summit was overcome by a series of inclined planes, with stationary engines, constructed by the State. The fifth great line, the Baltimore & Ohio, was opened in 1853 still farther south. The Tennessee River, a tributary of the Mississippi, was reached in 1850 by the Western & Atlantic Railroad of Georgia, and the Mississippi itself by the Memphis & Charleston Railroad in 1859. In the extreme north the Atlantic & St. Lawrence, now known as the Grand Trunk, was completed early in 1853. In 1858 the Virginia system was extended to a connection with the Memphis & Charleston and with the Nashville & Chattanooga Railroad.

The eight great works named, connecting the interior with the seaboard, are the trunks or base-lines upon which is erected the vast system that now overspreads the whole country. They serve as outlets to the interior for its products, which would have little or no commercial value without improved highways, the cost of transportation over which does not equal one-tenth that over ordinary roads. The works named, assisted by the Erie Canal, now afford ample means for the expeditious and cheap transportation of produce-seeking Eastern markets, and could without being overtaxed transport the entire surplus products of the interior.

Previous to 1850 by far the greater portion of railroads constructed were in the States bordering the Atlantic, and, as before remarked, were for the most part isolated lines, whose limited traffics were altogether local. Up to the date named, the internal commerce of the country was conducted almost entirely through water lines, natural and artificial, and over ordinary highways. The period of the settlement of California marks really the commencement of the new era in the physical progress of the United States. The vast quantities of gold it produced imparted new life and activity to every portion of the Union, particularly the Western States, the people of which, at the commencement of 1850, were thoroughly aroused as to the value and importance of railroads. Each presented great facilities for the construction of such works which promised to be almost equally productive. Enterprises were undertaken and speedily executed which have literally converted them into a network of lines, and secured their advantages to almost every farmer and producer.

The progress of these works in the aggregate, year by year, will be seen by the tabular statements at the close of the report. The only important line opened in the West, previous to 1850, was the one from Sandusky to Cincinnati, formed by the Mad River and Little Miami Roads. But these pioneer works were rude, unsubstantial structures compared with the finished works of the present day, and were employed almost wholly in the transportation of passengers.

With the advantages arising from the railroad routes, it is not at all surprising that our postal facilities have increased to such an extent that, next to the telegraphic wires, it may rank as one of the most extraordinary operative institutions in this or any other country in the world.

It will be perceived that in speaking of the department the author has paid little or no attention to the rebellion in connection with its operations. Situated as he is in the department, his opportunities are such that if the business of the office has lessened, as is supposed, in consequence, there is not a man engaged but must truly say that, instead of such being the case, their labors, as well as the business of the office, never presented a more stirring and flourishing appearance. In some respects it may have affected the general income, but upon the whole the vast increase of army letters and newspaper circulation, added to sundry articles of wearing-apparel coming under postal regulations, we question if this deficiency has not been partially, if not entirely, overcome. To a certain extent it affected foreign postage. The following statement, however, will convey a better idea of the postal finances than that of any theory established upon “why and whereof.” Figures, they say, never lie; but may not the master-hand forming them occasionally err in their formation?