Railways have also proved of great value in connection with the Cheap Postage system. By their means it has become possible to carry letters, newspapers, books and post parcels, in any quantity, expeditiously, and cheaply. The Liverpool and Manchester line was no sooner opened in 1830, than the Post Office authorities recognised its utility, and used it for carrying the mails between the two towns. When the London and Birmingham line was opened eight years later, mail trains were at once put on,—the directors undertaking to perform the distance of 113 miles within 5 hours by day and 5½ hours by night. As additional lines were opened, the old four-horse mail coaches were gradually discontinued, until in 1858, the last of them, the “Derby Dilly,” which ran between Manchester and Derby, was taken off on the opening of the Midland line to Rowsley. The increased accommodation provided by railways was found of essential importance, more particularly after the adoption of the Cheap Postage system; and that such accommodation was needed will be obvious from the extraordinary increase which has taken place in the number of letters and packets sent by post. Thus, in 1839, the number of chargeable letters carried was only 76 millions, and of newspapers 44½ millions; whereas, in 1865, the numbers of letters had increased to 720 millions, and in 1867 to 775 millions, or more than ten-fold, while the number of newspapers, books, samples and patterns (a new branch of postal business began in 1864) had increased, in 1865, to 98½ millions. To accommodate this largely-increasing traffic, the bulk of which is carried by railway, the mileage run by mail trains in the United Kingdom has increased from 25,000 miles a day in 1854 (the first year of which we have any return of the mileage run) to 60,000 miles a day in 1867, or an increase of 240 per cent. The Post Office expenditure on railway service has also increased, but not in like proportion, having been £364,000 in the former year, and £559,575 in the latter, or an increase of 154 per cent. The revenue, gross and net, has increased still more rapidly. In 1841, the first complete year of the Cheap Postage system, the gross revenue was £1,359,466 and the net revenue £500,789; in 1854, the gross revenue was £2,574,407, and the net revenue £1,173,723; and in 1867, the gross revenue was £4,548,129, and the net revenue £2,127,125, being an increase of 420 per cent. compared with 1841, and of 180 per cent. compared with 1854. How much of this net increase might fairly be credited to the Railway Postal service we shall not pretend to say; but assuredly the proportion must be very considerable.