Stephen Johnson Field,
United States v. Southern Pacific Railroad Company…
“ Surely congress can make a grant of lands which it owns or claims to own at any time, if it annex a condition that the grant shall not affect or impair the rights of a previous grantee. It would, as it seems to me, be an extravagant and utterly unwarranted assertion to say that congress, having made a grant for a railroad to run in one direction, is thereby prohibited from making another grant for a railroad to run in a different direction, if a condition is annexed that the second grant shall not affect or impair the rights of the first grantee. ”
