Two passers-by found the man lying face down near the railroad tracks off the 300 block of Neptune Way near North Cleveland Street about 6:40 p.m. Friday, Oceanside police Sgt. Matt Christensen said.
The two citizens saw that the man appeared to have sustained some type of trauma and initiated life-saving efforts, which were then continued by arriving fire personnel but were ultimately unsuccessful, according to Christensen.
The man died at the scene, Christensen said. His name was withheld pending family notification, he said.
Christensen said anyone with information should call Oceanside police.