Relective red markings. The Union Pacific M-19A Diesel Shop. Chicago Illinois. November 2007., a photo by Eddie from Chicago on Flickr.
I took this photo back in November of 2007.
Twilight has arrived at the Union Pacific Railroad's M 19A Diesel Shop on the west side of Chicago, and My camera's flash has activated the highly sensative reflective material used on these Union Pacific locomotives.
In recent times, the Union Pacific has begun to replace the red frame stripe with a reflective yellow one instead on most of their locomotives.