It is worthy of note that Stephenson, in making his first estimate of the cost of forming the railway according to the instructions of the directors, set down, as part of the cost, £6200 for stationary engines, not mentioning locomotives at all. It was the intention of the directors, in the first place, to employ only horses for the haulage of the coals, and fixed engines and ropes where horse-power was not applicable. The whole question of steam-locomotive power was, in the estimation of the public, as well as of practical and scientific men, as yet in doubt. The confident anticipations of George Stephenson as to the eventual success of locomotive engines were regarded as mere speculations; and when he gave utterance to his views, as he frequently took the opportunity of doing, it even had the effect of shaking the confidence of some of his friends in the solidity of his judgment and his practical qualities as an engineer. When Mr. Pease discussed the question with Stephenson, his remark was, "Come over and see my engines at Killingworth, and satisfy yourself as to the efficiency of the locomotive. I will show you the colliery books, that you may ascertain for yourself the actual cost of working. And I must tell you that the economy of the locomotive engine is no longer a matter of theory, but a matter of fact." So confident was the tone in which Stephenson spoke of the success of his engines, and so important were the consequences involved in arriving at a correct conclusion on the subject, that Mr. Pease at length resolved on paying a visit to Killingworth in the summer of 1822, in company with his friend Thomas Richardson, a considerable subscriber to the Stockton and Darlington undertaking,[52] to inspect the wonderful new power so much vaunted by their engineer. When Mr. Pease arrived at Killingworth village, he inquired for George Stephenson, and was told that he must go over to the West Moor, and seek for a cottage by the roadside with a dial over the door--"that was where George Stephenson lived." They soon found the house with the dial, and, on knocking, the door was opened by Mrs. Stephenson. In answer to Mr. Pease's inquiry for her husband, she said he was not in the house at present, but that she would send for him to the colliery. And in a short time Stephenson appeared before them in his working dress, just as he had come out of the pit.