"Extra 488 east depart Cumbres time not shown light for Alamosa (stop Sublette pick up section foreman railroad mail)"
Was the section foreman a person, who was carrying the railroad mail?
I guess he rode in the cab, since 488 was running light. I doubt they put him in the doghouse.
If he could have waited, he might could have rode in the caboose on the 499 train which was following.