Idaho Code § 62-202
If, at any time after the location of the line of the railroad and the filing of the maps and profiles thereof, as provided in the preceding section, it appears that the location can be improved, the directors may, as provided in subdivision 7, of section 62-104 [, Idaho Code], alter or change the same, and cause new maps and profiles to be filed, showing such changes, in the same offices where the originals are on file, and may proceed, in the same manner as the original location was acquired, to acquire and take possession of such new line, and must sell or relinquish the lands owned by them for the original location, within five (5) years after such change. No new location as herein provided, must be run so as to avoid any points named in their articles of incorporation.
Idaho Code § 62-202