Thanks Matt and Chris,
Great photo! I would argue with the assigned date of 1922 for the photo Chris posted. Here is an enlargement of a 2nd photo the same day:
https://breckhistoryarchives.org/uploads/r/breckenridge-history-archives-2/d/1/8/d18572720b3c914179bb8cfbd151c086bb7cdbce752f80ac0396baeb36ba8974/BHA.2017.6.4.jpgC&S 10 has a big Pyle headlight without visor, has lost its "intermediate tender" appearance. Baggage car number 3 has had the steel sheathing applied to the lower part of the sides. I would guess the photo was actually taken around 1927-1929.
This photo from the Colorado Rail Annual was dated to be 1927:
Number 10 has its modern appearing tender, but still carries the old oil headlight housing.
In Ferrell's book, number 10 was photographed at Idaho Springs in 1928, double heading a extra passenger train, likely an excursion up the Loop to Silver Plume:
Jim Courtney
Poulsbo, WA