I'm going to try and untangle the politics of this as best I can and guess what happened:There has not been much discussion of the Texas CR HSR plans lately, but the project was facing an attempt in the Texas legislature to kill it by preventing the Texas DOT from spending any funds at all to work with TCR on the HSR line. Here is a company proposing to privately fund a HSR corridor between the 2 largest cities in the state and even then, many Republicans want to kill or block it entirely. The news is that the language that would stop TCR was deleted in a 6-4 committee so that threat is over. I'm sure there are many more attempts in the works to stop the Dallas- Houston HSR line.
WFAA: Bullet train project saved in late-night vote.
Dallas Morning News: Budget writers remove provision that threatened bullet train proposal.
(1) There have been a lot of rumblings that the Koch Brothers are trying to foul the lines on this project as best they can. That's option number one. While TC isn't asking for public money, IIRC there are certain parts of the planning process which the DOT needs to offer comment on for various reasons. Depending on how the clause was worded, the amendment likely would have barred them from doing so even if said costs were reimbursed, really making for a mess of things.
(2) It's also possible that the Sen. who proposed the amendment is just an ***** who didn't have a good grasp on what he was doing. Trust me, you get someone trying to be too clever by half in the legislature and *ahem* hilarity ensues.
(3) #1 and #2 are not mutually exclusive.
So...while there's room for conspiracy, I'm also willing to grant the benefit of blind stupidity here as well.