Lives of the Engineers / The Locomotive. George and Robert Stephenson

by Samuel Smiles

The Manchester and Leeds line was in progress at the same time—an important railway connecting the principal manufacturing towns of Yorkshire and Lancashire. An attempt was made to obtain the Act as early as 1831; but its promoters were defeated by the powerful opposition of the landowners aided by the canal companies, and the project was not revived for several years. The line was somewhat circuitous, and the works were heavy; but on the whole the gradients were favourable, and it had the

advantage of passing through a district full of manufacturing towns and villages, teeming hives of population, industry, and enterprise. The Act authorising the construction of the railway was obtained in 1836; it was greatly amended in the succeeding year, and the first ground was broken on the 18th August, 1837.

In conducting this project to an issue, the engineer had the usual opposition and prejudices to encounter. Predictions were confidently made in many quarters that the line could never succeed. It was declared that the utmost engineering skill could not construct a railway through such a country of hills and hard rocks; and it was maintained that, even if the railroad were practicable, it could only be made at a ruinous cost.

During the progress of the works, as the Summit Tunnel, near Littleborough, was approaching completion, the rumour was spread abroad in Manchester that the tunnel had fallen in and buried a number of the workmen. The last arch had been keyed in, and the work was all but finished, when the accident occurred which was thus exaggerated by the lying tongue of rumour. An invert had given way through the irregular pressure of the surrounding earth and rock at a part of the tunnel where a “fault” had occurred in the strata. A party of the directors accompanied the engineer to inspect the scene of the accident. They entered the tunnel’s mouth preceded by upwards of fifty navvies, each bearing a torch.

After walking a distance of about half a mile, the inspecting party arrived at the scene of the “frightful accident,” about which so much alarm had been spread. All that was visible was a certain unevenness of the ground, which had been forced up by the invert under it giving way; thus the ballast had been loosened, the drain running along the centre of the road had been displaced, and small pools of water stood about. But the whole of the walls and the roof were still as perfect as at any other part of the tunnel.

The engineer explained the cause of the accident; the blue shale, he said, through which the excavation passed at that point, was considered so hard and firm, as to render it unnecessary to build the invert very strong there. But shale is always a deceptive material. Subjected to the influence of the atmosphere, it gives but a treacherous support. In this case, falling away like quicklime, it had left the lip of the invert alone to support the pressure of the arch above, and hence its springing inwards and upwards. Mr. Stephenson directed the attention of the visitors to the completeness of the arch overhead, where not the slightest fracture or yielding could be detected. Speaking of the work, in the course of the same day, he said, “I will stake my character and my head, if that tunnel ever give way, so as to cause danger to any of the public passing through it.

Taking it as a whole, I don’t think there is such another piece of work in the world. It is the greatest work that has yet been done of this kind, and there has been less repairing than is usual,—though an engineer might well be beaten in his calculations, for he cannot beforehand see into those little fractured parts of the earth he may meet with.” As Stephenson had promised, the invert was put in; and the tunnel was made perfectly safe.

The construction of this subterranean road employed the labour of above a thousand men for nearly four years. Besides excavating the arch out of a solid rock, they used 23,000,000 of bricks, and 8000 tons of Roman cement in the building of the tunnel. Thirteen stationary engines, and about 100 horses, were also employed in drawing the earth and stone out of the shafts. Its entire length is 2869 yards, or nearly 1¾ mile—exceeding the famous Kilsby Tunnel by 471 yards.