The work consisted of making a compilation from records, or from actual surveys when necessary, of about 625 miles of railway property, including several important terminals. The property had been built between 1860 and 1901, mostly in the early part of this period. The portions which had been constructed during the latter part of the period, say from 1890 to 1906, presented no difficulties, as the records were very clear and complete, but the portions constructed in the Sixties had practically no records. Some had been built by small independent companies, which were acquired later by the Northwestern System. On these old lines the records were practically nil, and those in existence were soon found to be of absolutely no use. Even on the newer lines it was found that many changes had been made within a few years after their construction, and that it was sometimes more economical, as regards time at least, to make a new survey of the property than to use the records. After examining all the old records very thoroughly, and endeavoring to get some order and information out of them, it was decided that the only way to do the work properly was to make a complete survey and valuation of all the physical property. Several field parties were organized and also an office force, about twenty men being put on the work. The parties ran levels for profile purposes, cross-sectioned cuts where necessary, noted evidences of clearing and grubbing, of the character of the cuts, and the disposal of the material, examined the ballast for depth and character, examined the rails for age, weight, and condition, and noted the kind and condition of the fences, gates, farm crossings, planking, whistle and highway-crossing posts, culverts, bridges, and in fact every detail of construction. Advantage was also taken of the survey to re-station the lines, to paint such stations on the rails, and to set permanent posts, so that afterward the stationing could be picked up at any time with little trouble. In this way there was accomplished much work of value to the railway company, for which there had been a demand by the division officials for years, but which had not been done because of lack of men and money.