The stagecoach was established in England as a public conveyance early in the sixteenth century, and soon regular routes were developed throughout the country. Now for the first time a closed vehicle afforded travelers comparative comfort during their journey, and in the stagecoach with its definite schedule may be seen the early prototype of the modern passenger railroad. For three centuries the stagecoach slowly developed, and its popularity carried it to the continent and later to America. But by a radical invention transportation was suddenly transformed. As early as the middle of the sixteenth century, and actually contemporaneous with the inception of the stagecoach, railways, or wagon-ways, had their origin. At first these primitive railways were built exclusively to serve the mining districts of England and consisted of wooden rails over which horse-drawn wagons might be moved with greater ease than over the rough and rutted roads. The next step forward was brought about by the natural wear of the wheels on the wooden tracks, and consisted of a method of sheathing the rails with thin strips of iron. To avoid the buckling which soon proved a fault of this innovation, the first actual iron rails were cast in 1767 by the Colebrookdale Iron Works. These rails were about three feet in length and were flanged to keep the wagon wheels on the track. For a number of years this simple type of railroad existed with little change. Over it freight alone was carried, and its natural limitations and high cost, compared with the transportation afforded by canals, seemed to hold but little promise for future expansion. As early as 1804 Richard Trevithick had experimented with a steam locomotive, and in the ten years following other daring spirits endeavored to devise a practical application of the steam engine to the railway problem. But in 1814 George Stephenson's engine, the "Blucher," actually drew a train of eight loaded wagons, a total weight of thirty tons, at a speed of four miles an hour, and the age of the steam railroad had begun. The first railroad to adopt steam as its motive power was the Stockton & Darlington, a "system" comprising three branches and a total of thirty-eight miles of track. On the advice of Stephenson, horse power was not adopted and several steam engines were built to afford the motive power. This road was opened on September 27, 1825, and preceded by a signalman on horseback a train of thirty-four vehicles weighing about ninety tons departed from the terminus with the applause of the amazed spectators. The novelty of this new venture soon appealed so strongly to popular fancy that a month later a passenger coach was added, and a daily schedule between Stockton & Darlington was inaugurated.