Stephen Johnson Field,
Deseret Salt Company v. Tarpey…
“ The lands were granted to aid in the construction of the railroad and telegraph line, and it is manifest from different provisions of the act that congress intended to secure this application of them. Whatever disposition might be made by the company of the lands after they became, by the definite location of the road, capable of identification, they were subject to the control of congress, either to compel their application for the construction of the road contemplated, or to enforce their forfeiture if the road was not completed as required by the act. ”
