And yet his large experience of railways and locomotives, as described by himself to the committee, entitled this "untaught, inarticulate genius," as he has been described, to speak with confidence on the subject. Beginning with his experience as a brakesman at Killingworth in 1803, he went on to state that he was appointed to take the entire charge of the steam-engines in 1813, and had superintended the railroads connected with the numerous collieries of the Grand Allies from that time downward. He had laid down or superintended the railways at Burradon, Mount Moor, Springwell, Bedlington, Hetton, and Darlington, besides improving those at Killingworth, South Moor, and Derwent Crook. He had constructed fifty-five steam-engines, of which sixteen were locomotives. Some of these had been sent to France. The engines constructed by him for the working of the Killingworth Railroad, eleven years before, had continued steadily at work ever since, and fulfilled his most sanguine expectations. He was prepared to prove the safety of working high-pressure locomotives on a railroad, and the superiority of this mode of transporting goods over all others. As to speed, he said he had recommended eight miles an hour with twenty tons, and four miles an hour with forty tons; but he was quite confident that much more might be done. Indeed, he had no doubt they might go at the rate of twelve miles. As to the charge that locomotives on a railroad would so terrify the horses in the neighborhood that to travel on horseback or to plow the adjoining fields would be rendered highly dangerous, the witness said that horses learned to take no notice of them, though there were horses that would shy at a wheelbarrow. A mail-coach was likely to be more shied at by horses than a locomotive. In the neighborhood of Killingworth, the cattle in the fields went on grazing while the engines passed them, and the farmers made no complaints.
Mr. Alderson, who had carefully studied the subject, and was well skilled in practical science, subjected the witness to a protracted and severe cross-examination as to the speed and power of the locomotive, the stroke of the piston, the slipping of the wheels upon the rails, and various other points of detail. Stephenson insisted that no slipping took place, as attempted to be extorted from him by the counsel. He said, "It is impossible for slipping to take place so long as the adhesive weight of the wheel upon the rail is greater than the weight to be dragged after it." There was a good deal of interruption to the witness's answers by Mr. Alderson, to which Mr. Joy more than once objected. As to accidents, Stephenson knew of none that had occurred with his engines. There had been one, he was told, at the Middleton Colliery, near Leeds, with a Blenkinsop engine. The driver had been in liquor, and put a considerable load on the safety-valve, so that upon going forward the engine blew up and the man was killed. But he added, if proper precautions had been used with that boiler, the accident could not have happened. The following cross-examination occurred in reference to the question of speed:
"Of course," he was asked, "when a body is moving upon a road, the greater the velocity the greater the momentum that is generated?" "Certainly." "What would be the momentum of forty tons moving at the rate of twelve miles an hour?" "It would be very great." "Have you seen a railroad that would stand that?" "Yes." "Where?" "Any railroad that would bear going four miles an hour: I mean to say, that if it would bear the weight at four miles an hour, it would bear it at twelve." "Taking it at four miles an hour, do you mean to say that it would not require a stronger railway to carry the same weight twelve miles an hour?" "I will give an answer to that. I dare say every person has been over ice when skating, or seen persons go over, and they know that it would bear them better at a greater velocity than it would if they went slower; when they go quick, the weight in a measure ceases." "Is not than upon the hypothesis that the railroad is perfect?" "It is; and I mean to make it perfect."
It is not necessary to state that to have passed through his severe ordeal scatheless needed no small amount of courage, intelligence, and ready shrewdness on the part of the witness. Nicholas Wood, who was present on the occasion, has since stated that the point on which Stephenson was hardest pressed was that of speed. "I believe," he says, "that it would have lost the company their bill if he had gone beyond eight or nine miles an hour. If he had stated his intention of going twelve or fifteen miles an hour, not a single person would have believed it to be practicable." Mr. Alderson had, indeed, so pressed the point of "twelve miles an hour," and the promoters were so alarmed lest it should appear in evidence that they contemplated any such extravagant rate of speed, that immediately on Mr. Alderson sitting down, Mr. Joy proceeded to re-examine Stephenson, with the view of removing from the minds of the committee an impression so unfavorable, and, as they supposed, so damaging to their case. "With regard," asked Mr. Joy, "to all those hypothetical questions of my learned friend, they have been all put on the supposition of going twelve miles an hour: now that is not the rate at which, I believe, any of the engines of which you have spoken have traveled?" "No," replied Stephenson, "except as an experiment for a short distance." "But what they have gone has been three, five, or six miles an hour?" "Yes." "So that those hypothetical cases of twelve miles an hour do not fall within your general experience?" "They do not."
The committee also seem to have entertained some alarm as to the high rate of speed which had been spoken of, and proceeded to examine the witness farther on the subject. They supposed the case of the engine being upset when going at nine miles an hour, and asked what, in such a case, would become of the cargo astern. To which the witness replied that it would not be upset. One of the members of the committee pressed the witness a little farther. He put the following case: "Suppose, now, one of these engines to be going along a railroad at the rate of nine or ten miles an hour, and that a cow were to stray upon the line and get in the way of the engine; would not that, think you, be a very awkward circumstance?" "Yes," replied the witness, with a twinkle in his eye, "very awkward—for the coo!" The honorable member did not proceed farther with his cross-examination; to use a railway phrase, he was "shunted." Another asked if animals would not be very much frightened by the engine passing at night, especially by the glare of the red-hot chimney? "But how would they know that it wasn't painted?" said the witness.
On the following day (the 26th of April) the engineer was subjected to a most severe examination. On that part of the scheme with which he was most practically conversant, his evidence was clear and conclusive. Now, he had to give evidence on the plans made by his surveyors, and the estimates which had been founded on those plans. So long as he was confined to locomotive engines and iron railroads, with the minutest details of which he was more familiar than any man living, he felt at home and in his element. But when the designs of bridges and the cost of constructing them had to be gone into, the subject being comparatively new to him, his evidence was much less satisfactory.
He was cross-examined as to the practicability of forming a road on so unstable a foundation as Chat Moss.
"'Now, with respect to your evidence upon Chat Moss,' asked Mr. Alderson, 'did you ever walk on Chat Moss on the proposed line of the railway?' 'The greater part of it, I have.'
"'Was it not extremely boggy?' 'In parts it was.'