SEC. 4. The company hereby created shall also have power to enter upon and occupy the lands of individuals or of companies, on making payment therefor or giving security according to law, for the purpose of erecting, constructing, maintaining, or managing any public work, such as is provided for or mentioned in the second section of this act, and to construct and erect such works thereon, and also such buildings, improvements, structures, roads, or fixtures as may be necessary or convenient for the purposes of the said company, under the powers herein granted; and to purchase, make, use, and maintain any works or improvements connecting or intended to be connected with the works of the said company; and to merge or consolidate, or unite with the said company the improvements, property, and franchises of any other company or companies, on such terms and conditions as the said company may agree upon; and to fix and regulate the tolls or charges to be charged or demanded for any freight, property, or passengers travelling or passing over any improvement erected, managed, or owned by the said company, or on any merchandise or property transported over any road whatever by the said company, and to make, from time to time dividends from the profits made by said company; the several railroads managed by said company shall continue taxable, as heretofore, in proportion to their length within this state respectively; and the said Pennsylvania Company shall be taxable only on the proportion of dividends on its capital stock and upon net earnings or income, only in proportion to the amount actually carried by it within the state of Pennsylvania, and all its earnings or income derived from its business beyond the limits of this Commonwealth shall not be liable for taxation.