Nice shot! When this engine was built in July 1958, it was painted in Duluth Missabe and Iron Range colors and tested on the DM&IR in Minnesota. EMD thought that based on the number of SD9/18s the Missabe had in service, they would want the SD24. In the end the Missabe passed on the SD24 mainly due to the extra maintenance of the turbocharger. Some people say that the SD24 concept was tested on the Missabe to avoid embarrassment of a failure on a busy class one railway like Union Pacific. In the end no one will really ever know the reason and the UP ended up with the engine anyway.