When government inspectors were first appointed by the Board of Trade to examine and report upon the working of railways, they were alarmed by the number of trains following each other at some stations in what then seemed to be a very rapid succession. A passage from a Report written in 1840 by Sir Frederick Smith, as to the traffic at "Taylor's Junction," on the York and North Midland Railway, contrasts curiously with the railway life and activity of the present day: "Here," wrote the alarmed inspector, "the passenger trains from York, as well as Leeds and Selby, meet four times a day. No less than 23 passenger-trains stop at or pass this station in the 24 hours--an amount of traffic requiring not only the most perfect arrangements on the part of the management, but the utmost vigilance and energy in the servants of the Company employed at this place." Contrast this with the state of things now. On the Metropolitan Line, 667 trains pass a given point in one direction or the other during the eighteen hours of the working day, or an average of 36 trains an hour. At the Cannon-street Station of the Southeastern Railway, 527 trains pass in and out daily, many of them crossing each others' tracks under the protection of the station signals. Forty-five trains run in and out between 9 and 10 A.M., and an equal number between 4 and 5 P.M. Again, at the Clapham Junction, near London, about 700 trains pass or stop daily; and though to the casual observer the succession of trains coming and going, running and stopping, coupling and shunting, appears a scene of inextricable confusion and danger, the whole is clearly intelligible to the signal-men in their boxes, who work the trains in and out with extraordinary precision and regularity. The inside of a signal-box reminds one of a piano-forte on a large scale, the lever-handles corresponding with the keys of the instrument; and, to an uninstructed person, to work the one would be as difficult as to play a tune on the other. The signal-box outside Cannon-street Station contains 67 lever-handles, by means of which the signal-men are enabled at the same moment to communicate with the drivers of all the engines on the line within an area of 800 yards. They direct by signs, which are quite as intelligible as words, the drivers of the trains starting from inside the station, as well as those of the trains arriving from outside. By pulling a lever-handle, a distant signal, perhaps out of sight, is set some hundred yards off, which the approaching driver--reading it quickly as he comes along--at once interprets, and stops or advances, as the signal may direct.