This is the case about the Railroad Killer - Angel Resendiz & his known victims. Angel was a drifter who did most of his killings near/around railroad tracks.
https://en.wikipedia.org/wiki/ÁngelMaturinoReséndiz
https://criminalminds.fandom.com/wiki/ÁngelMaturinoReséndiz
https://www.myplainview.com/news/article/Resendiz-s-15-known-victims-8555268.php