According to Hol Wagner, the "Colorado & Southern" on the cab, beneath the cab windows was the original lettering scheme that preceded the entwined C&S "Columbine" monogram, "Style 1", below (Hol Wagner,
The Colorado Road, page 411.):
C&S number 4 carries the same lettering in c1900 (notice how "Keep Off" didn't quite fit on the original pilot beam):
Before showing up at Darel's favorite place a few years later:
Jim Courtney
Poulsbo, WA