Chicago, Rock Island & Pacific Railroad EMD yard switcher diesel locomotives at work, circa 1970's era.

 

I found this photograph from the defunct Rock Island

Railroad on the internet. (No location given.)

 

Two Chicago, Rock Island & Pacific Railroad EMD SW 1

yard switcher locomotives, are viewed at work coupled

M.U (Multiple Unit) together.

 

The engine to the left, is wearing the late 1960's era -

maroon and yellow color scheme, while the locomotive

to the right, wears the bright red and yellow color

scheme introduced around 1970.