Uh... not in the US, there isn't.
Did you think CAHSR was going to lay the track by hand?
CA also is walking with basic train service. The Pacific Surfliner (3rd most used Amtrak route) and the San Joaquin (5th most used Amtrak route). Literally the 2 most used Amtrak routes outside of the northeast.
This is what zero miles of track looks like a year later: https://youtu.be/luX35wVJt84
You can today in the Central Valley look at large construction sites and structures, some of which are finished. Go 100 miles up the alignment, and see construction and structures there too. None of those sites have laid track yet, but there’s hundred of miles of trackway under development.
Track comes last.
Of course, if they had started with a ten mile section of track in some place easy to drop in tracks then everyone'd make fun of it for only having two stations ten miles apart or something.
Maybe we should do a crawl/walk/run instead of jumping directly to HSR.