It’s the last page is the PDF: https://railroads.dot.gov/sites/fra.dot.gov/files/2023-12/FY22 CID Project Summaries-Map-r1.pdf
In case they use some kind of hotlink protection, here’s the link to the main website: https://railroads.dot.gov/elibrary/fy22-CID-program-selections
Removing /repo is not considered safe, but I just removed its contents anyways and then just ran a repair.
That actually resulted in more available disk space than after running the garbage collection.
And my flatpak apps still work 🤷♀️