Frankly, I find it hard to blame Congress for wanting to do so right now.
They provided a ton of extra money to ensure the return of service to pre-pandemic levels and the railroad did not fulfill its contract, re-cutting service when there was no shortage of riders. If Amtrak was funded on the same kind of grants that paid my salary when I worked at a research lab, it would be ordered to return about $500M of this year's money for failure to deliver.
I DO want to know where the hell all the money went, if it didn't go to operations, didn't go to staff salaries, and didn't go to catching up a backlog of maintenance.
"Failure to deliver" what? The whole point of scientific research is that a lot of times (maybe most of the time) the researchers don't discover anything. I think it's called "null results" or something like that. And since scientific journals don't like to print reports of null results, even if they really should, how can a funding agency justify forcing someone returning money for coming up with a null result? I knew our system of funding for science research was screwed up, but I didn't think it was that bad.
Another analogy would be venture capital start-ups. They take zillions of dollars from venture capitalists, who, nevertheless will not be asking for money back when the venture crashes and burns, as most of them do. Apparently, there are entrepreneurs out there who make a good living being business failures. the venture capitalists tolerate this state of affairs because one success will recover all of the other losses and more.
As for Amtrak, we know what the problem was, two bad management decisions made in response to the pandemic -- laying off too many staff and putting rolling stock into mothballs. This was exacerbated by the fact that they insist on using hair follicle testing to screen for cannabis use at a time when cannabis use has become legal. This is probably making it harder for them to hire people in many locations, which means that intake of replacement workers has slowed. Under those conditions, the service cutbacks are no surprise. As for what they've done with the money appropriated earlier this year, the vast majority of it is for capital projects, which take years to be completed, and it seems that we're getting reports that things are starting to move on many of them.
As for the Amtrak operating subsidy, the House approved $2.3 billion. Yes, I know that Amtrak asked for $3.3 billion and the White House proposed $3 billion, but it wasn't to long ago that the enacted appropriated operating subsidy was on the order of $1 billion, with the White House proposing to zero out all funding. Sure, I know that RPA and other rail advocates have to keep on pushing for the full amount until the funding is finally enacted, but a $2.3 billion operating subsidy is a lot better than what we've had in recent years.