Red Torch Cactus
The angle of the photo really tells the tale of why this is called the Red Torch Cactus.
On the other hand, the flower color is actually pretty variable.
The stems can get to 3′ tall in clusters, and it looks a lot like an Echinocereus, but it’s from South America so it’s an Echinopsis. Although it has been mistaken for Echinocereus, and used to be called Trichocereus, and sometimes grouped with the Lobivias.