There is a back story on how this came to be, but as a rail fan, I really didn't care. Some real colorful video & pics are the result of a planned set of head end power being last minute replaced by these KCS locomotives.
https://www.youtube.com/watch?v=P6dn7CmBX7c&t=33s
https://www.youtube.com/watch?v=P6dn7CmBX7c&t=33s
Better to be a "Has Been" than a "Never Been?" Says the retired guy. :)