
Source: Report of the Superintendent of the New York and Erie Railroad to the Stockholders (1856), p. 35-36: Partly cited in: George Leonard Vose. Handbook of Railroad Construction: For the Use of American Engineers. Containing the Necessary Rules, Tables, and Formulæ for the Location, Construction, Equipment, and Management of Railroads, as Built in the United States. J. Munroe, 1857. p. 415-16