“Did you hear about the Mexican train killer? He had loco motives”

A train pun was posted on Reddit on October 4, 2012:
   
“Did you hear about the Mexican train killer? He had locomotives.”
 
The “loco motives”/“locomotives” joke has been printed on several images.
       
   
Reddit
Did you hear about the Mexican train killer? (quickmeme.com)
submitted October 4, 2012 by [deleted]
(...)
COMMENTS
qkme_transcriber
Here is what the linked Quickmeme image says in case the site goes down or you can’t reach it:
 
Title: Did you hear about the Mexican train killer?
Meme: Bad Joke Eel
DID YOU HEAR ABOUT THE MEXICAN TRAIN KILLER?
HE HAD LOCOMOTIVES
 
Twitter
Ignacio
‏@512megabytes
DID YOU HEAR ABOUT THE MEXICAN TRAIN KILLER? HE HAD LOCOMOTIVES. #LOL
5:42 PM - 4 Oct 2012
 
Twitter
Tanner Parkes
‏@TannerLeeParkes
Did you hear about the Mexican train killer? He had locomotives. #stolenfromreddit
6:33 PM - 4 Oct 2012
 
Twitter
Harvey Danger
‏@BloodyElbow22
Did u hear about the Mexican train killer…he had locomotives
6:43 PM - 4 Oct 2012
 
Reddit
Have you ever heard of the mexican train killer?
submitted April 10, 2013 by exilelexxii
He had loco motives
 
Reddit
Did you hear about the Mexican train killer?
submitted August 17, 2014 by Snazzymf
He had loco motives.
 
Reddit
Did you hear about the Mexican train killer?
submitted September 29, 2016 by Bliefo
He had locomotives.