From Richard Crabtree on the Frisco Rails Across Missouri Facebook group: Here we see Frisco No. 759 GP-40-2 & GP38-2 663 on a Ri bbon Rail Train May 1979 at Thayer, Missouri
Good contrast in the look between brand new, and well weathered. 759 looks sharp being that it had just been delivered that month, while 663 could use a little love being that it was 8 years old at this point. Amazing how fast the look can fade.