Digital Live Sound Video: A 1970's era Illinois Central Gulf train with a former G,M & O locomotive and caboose acqired through merger in 1972. a video by Eddie from Chicago on Flickr.
Railroads that merge and become "New" companies, often have a large roster of equipment and color schemes from the previous or Fallen Flag" railroads rolling around on the nation's rails for several years after the fact.
The train shown here, is my own interpretation of an early 1970's era freight train from the former Illinois Central Gulf Railroad, circa 1972 or possibly 1973.
The ICG was created from the August 10th, 1972 merger of the Illinois Central, and the Gulf, Mobile & Ohio Railroads. This early 1974 era ICG train, features a former Gulf, Mobile & Ohio Railroad EMD roadswitcher diesel and caboose, which were both acquired through merger in 1972, and have yet to visit the company paint shop.
I seen many ICG trains like this, when I was growing up on the near southwest side of Chicago during the 1970's.