Beginning in 1968, on either new units or on most repainted units, the Rio Grande lettering was made larger, with the Rio made 24 inches high, and Grande made 60 inches high.
The first locos to get this scheme were SD45s assigned to the Kaiser Steel unit coal train to California. Five GP9s (5902, 5903, 5904, 5911, 5954) got this lettering. The Walthers models in this run are 5903 and 5911. Below is a Jim Parker photo of 5904. Comparing the model paint to prototype photos, the large lettering appears to be correctly placed on each side of the long hood. A smaller black panel with the older flying Rio Grande appears on the short hood front. As on the prototype, the long hood rear does not have this patch. The engineer and fireman figures in the cab correctly face the short hood front of the loco.I have the sound and DCC version. The ESU sound provided is a lower-cost subset that doesn't have features like prime mover delay on full-featured loco decoders. It also has a limited set of horn and bell options. These are Horns: CV163 = 0 - Leslie A-200 CV163 = 1 - Wabco single-chime CV163 = 2 - Nathan M3 (default) CV163 = 3 - Leslie S3L Bells: CV164 = 0 - Bronze bell (default) CV164 = 1 - Steel bell. I'm satisfied with this sound.
Watchng videos with sound of the D&RGW prototype locos, they appear to have Nathan M3 horns, the default, although the plastic horn detail on the model looks more like a too-small Leslie. As I usually do, I set the acceleration and deceleration momentum CVs 3 and 4 to 0; the flywhweel momentum in the model is enough for me. These were the only CV changes I needed to make.