497 returned to freight service, after overhaul, on July 10, 1967. After this there were five occasions when three K37s - 493, 497, and 498 met in Chama, but only the October 3 operation matches what is seen in the photo that is the subject of this thread:
July 25 - 497 and 493 made 2 Cumbres turns. 498 and 487 ran to Durango
August 17- 493 and 498 made a Cumbres turn and run to Alamosa. 497 ran to Durango. No K36 in Chama
August 29 - 497 and 493 ran to Alamosa. 498 ran to Durango. No K36 in Chama
September 12 - 493 and 498 ran to Alamosa. 497 ran to Durango. No K36 in Chama
October 3 - 497 and 487 made 2 Cumbres turns. 493 and 498 ran to Durango
The October 3 operations were the last time three K37s were present in Chama