the Santa Fe yard in Kansas City, Kansas, March 1943
From shorpy.com. One of the comments: "For a long time, it was thought best to keep the new and high maintenance diesels in the yard, where they could do less damage if they broke down. Also, it was thought that diesel-electrics were not well siuted to hauling main line fast freight. The EMD (originally EMC) FT demonstrator tour had a lot to do with changing that attitude, by proving that a stock diesel locomotive design could replace steam locomotives in everyday road service all over the country."