I'm guessing that these are some of the "on the tracks" pictures of Adam Ramzi posted several years ago in this thread but no longer viewable through the links originally used. The images, shot by Ryan Edward Scott, are worth reinstating ...
https://1.bp.blogspot.com/-eLlcLMweKMI/VPxxPwI9OYI/AAAAAAACtjE/j2TuKlKt1AQ/s1600/cg.gif