preliminary designation of the general route of the road, and the exclusion from sale, entry, or preëmption of the adjoining odd sections within forty miles on each side, until the definite location is made. The third section declares that after the general route shall be fixed, the President shall cause the lands to be surveyed for forty miles in width on both sides of the entire line as fast as may be required for the construction of the road, *72 and that the odd sections granted shall not be liable to sale, entry, or preëmption, before or after they are surveyed, except by the company. The general route may be considered as fixed when its general course and direction are determined after an actual examination of the countryor from a knowledge of it, and is designated by a line on a map showing the general features of the adjacent country and the places through or by which it will pass. The officers of the Land Department are expected to exercise supervision over the matter so as to require good faith on the part of the company in designating the general route, and not to accept an arbitrary and capricious selection of the line irrespective of the character of the country through which the road is to be constructed. When the general route of the road is thus fixed in good faith, and information thereof given to the Land Department by filing the map thereof with the Commissioner of the General Land Office, or the Secretary