This is the last one. Thanks for taking the time to look at these and further my education.
Impossible to say with absolute conviction without flowers (like so many cacti) but you could spend hours looking at either Cleistocactus or Haageocereus as the genus.
I agree. This one has Cleisto written all over it.
I'd say in all likelihood Cleistocactus strausii, but until it gets a bit older, hard to tell from C. hyalacanthus/tarijensis, and C. tupizensis.