By October, 1832, seven coaches, belonging to various proprietors, were doing fifty journeys a week between different places on the line; so that thus far the original idea of Parliament, in enforcing against railways the principle of a common user of their lines by the public, had appeared to be warranted. A year later, however, the railway company, finding, as Jeans tells us, that it would be more convenient and more advantageous for them to take the whole carrying trade in their own hands and supersede the horses by steam locomotives, bought out, on what were considered generous terms, the interests of the four coach proprietors then carrying passengers on their own account on the lines.

Actual experience had thus nullified the expectation that a railway would be simply a rail-road upon which anyone would be able to run his own conveyances as on an ordinary turnpike road.

From October, 1833, the whole of the passenger traffic (then undergoing rapid expansion) was conducted by the company. In April, 1834, the directors, who had by this time acquired some other and better engines, announced that they had commenced to run, six times a day, both "coaches" (for passengers) and "carriages" (for goods) by locomotives; and this date, probably, marks the final disappearance of the horse as a means of traction for passenger traffic on public railways in England, though the word "coaches," introduced into the railway vocabulary under the circumstances here narrated, has remained in use ever since among railway men as applied to rolling stock for passenger traffic.

Unlike its predecessors in Surrey, and though facing various difficulties at the outset, the Stockton and Darlington line attained to a considerable degree of prosperity. After undergoing various extensions from time to time, and playing a leading part in the industrial expansion of the district it served, it was incorporated into what is now the North-Eastern Railway system.

Summing up the respects in which the Stockton and Darlington line had carried forward the story of railway development, we find that it (1) established the practicability of substituting locomotive for horse traction on railways; (2) introduced the provision of waggons by the railway company, instead of leaving these to be found by carriers and traders; (3) proved that railways were as well adapted to the transport of passengers as they were to the carriage of goods; (4) showed by actual experience that the idea of a common user of railways was impracticable; and (5) prepared the way for the eventual recognition, even by Parliament itself, of the principle that transport on a line of railway operated by locomotives must, in the nature of things, be the monopoly of the owning and responsible railway company.

While the Surrey Iron Rail-way and the Stockton and Darlington Railway had been thus seeking to establish themselves as public railways, there was no lack of advocates of what were then called "general rail-ways," to be laid either on the ordinary roads or on roads made for the purpose; and such general railways were especially advocated for districts where canals could not be made available.

Dr James Anderson, writing on "Cast Iron Rail-ways" in the issue of his "Recreations in Agriculture, Natural History," etc., for November, 1800, had already strongly recommended them as "an eligible mode of conveyance where canals cannot be conveniently adopted"; and he especially advised the construction of one railway in London, from the new docks on the Isle of Dogs to Bishopsgate Street, and another between London and Bath, "for the purpose of conveying unsightly loads, leaving the roads, as at present, open for coaches and light carriages." Such railways, he argued, would render great service in relieving the ordinary road of heavy traffic, and help to solve the road problem of that day—all the more acute because McAdam had not yet shown the country how roads could and should be made or repaired.

On February 11, 1800, Mr Thomas, of Denton, read a paper before the Newcastle Literary Society recommending the introduction of railways, on the colliery principle, for the general carriage of goods; and R. L. Edgeworth urged, in "Nicholson's Journal," in 1802, that for a distance of ten miles or more one of the great roads out of London should be provided with four tracks of railway operated by stationary engines and circulating chains for fast and slow traffic in each direction.

But the most strenuous advocate of all was Thomas Gray. Both before and subsequent to the publication, in 1820, of the first edition of his "Observations on a General Rail-way," he had been pressing his views, in the form of petitions, letters or articles, on members of the Government, peers of the realm, M.P.'s, corporations, capitalists, reviews and newspapers. His idea was that there should be six trunk lines of railway radiating from London, with branch lines linking up towns and villages off these main routes; but he was looked upon as a visionary, if not as a crank and a bore whose impracticable proposals were not deserving of serious consideration. It was evidently Thomas Gray whom the "Quarterly Review" had in mind when it said, in March, 1825: "As to those persons who speculate on making railways general throughout the Kingdom, and superseding all the canals, all the waggons, mail and stage-coaches, post-chaises, and, in short, every other mode of conveyance by land and water, we deem them and their visionary schemes unworthy of notice."

In the result Gray was left to spend the last years of his life in obscurity and poverty, and the further development of the railway system of the country was proceeded with on lines altogether different from, and far less efficient, than those he had recommended.