This unit has had upgraded couplers and additional details. Added to the locomotive.It has not been ran on the track.It is still a new inbox.It has just been completed built.But not ran The Athearn Blue Box Locomotive SD40-2 Illinois Central Extra Detailed is a highly detailed model train locomotive designed for model railroads and trains enthusiasts. With a focus on authenticity and accuracy, this locomotive features intricate detailing characteristic of Athearn’s Blue Box series. Perfect for collectors and hobbyists looking to enhance their train layout with a realistic representation of the Illinois Central railroad.