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Updated: June 11, 2025
Brunel, colossal less in proportions than cost. It has been well observed, that there was more talent shown on a certain division of the New-York and Erie Railway, in avoiding the necessity for viaducts, than could possibly have been exhibited in constructing them. This remark is a key to the difference between the old English and the American systems of civil engineering.
One would not have believed in it for a moment if one had seen it first in a sketch. Even the railway, on which we soon looked down, was inspired to gymnastic feats, leaping across chasms on giddy viaducts, and twisting back upon itself in corkscrew tunnels. There were thrilling retrospective views away to the giant Alps we were leaving behind, but soon, nearer mountains crowded them out of sight.
Hills have been cut down and valleys filled up; and when these simple expedients have not sufficed, high and magnificent viaducts have been raised, and if mountains stood in the way, tunnels of unexampled magnitude have pierced them through, bearing their triumphant attestation to the indomitable energy of the nation, and the unrivalled skill of our artisans.”
For the sake of distinctness of conclusion, I will suppose your success absolute: that from shore to shore the whole of the island is to be set as thick with chimneys as the masts stand in the docks of Liverpool: and there shall be no meadows in it; no trees; no gardens; only a little corn grown upon the housetops, reaped and threshed by steam: that you do not leave even room for roads, but travel either over the roofs of your mills, on viaducts; or under their floors, in tunnels: that, the smoke having rendered the light of the sun unserviceable, you work always by the light of your own gas: that no acre of English ground shall be without its shaft and its engine; and therefore, no spot of English ground left, on which it shall be possible to stand, without a definite and calculable chance of being blown off it, at any moment, into small pieces.
The curriculum of study imparted by Professor Rankine includes the stability of structures; the strength of materials; the principle of the actions of machines; prime movers, whether driven by animal strength, wind, or the mechanical action of heat; the principles of hydraulics; the mathematical principles of surveying and levelling; the engineering of earthwork, masonry, carpentry, structures in iron, roads, railways, bridges, and viaducts, tunnels, canals, works of drainage and water supply, river works, harbour works, and sea coast works.
The gradients are easy, and the curves obtuse. There are no viaducts of any importance, and only four tunnels along the whole length of the line. The shortest of these does not exceed a mile and a half.
A new idea seemed to cross Tyrrel's mind. He leant forward suddenly. "But as to safety," he asked, with some anxiety, "viewed as a matter of life and death, I mean? Which of these two viaducts is likely to last longest, to be freest from danger, to give rise in the end to least and fewest accidents?" "Why, your friend Le Neve's, of course," the millionaire answered, without a moment's hesitation.
Railroads were compared, as an investment, to banks; and it was even supposed that the more they cost the more they would divide; and tunnels, rock-cuts, and viaducts were then as much sought after as they are now avoided.
It consists of twenty arches of 60 feet span, springing 16 feet from the perpendicular shaft of each pier, and 60 feet in height from the crown of the arches to the level of the river. The foundations of the piers were built on piles driven 20 feet deep. The structure has a solid and majestic appearance, and is perhaps the finest of George Stephenson’s viaducts.
As soon as all this has been done, and the Act of Parliament authorising the line obtained, an accurate plan and section of the whole line is made, from which the engineer ascertains and lays down its gradients, in other words its ascents and descents, determines the number and size of the bridges and viaducts to be made, calculates the quantity of embankments required to fill up hollows, and the number of cuttings to level obstructions, in which latter calculations he estimates that the cutting down of elevations will be made subservient as far as may be, to the elevation of depressions.
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