Bill,
I don't have any first hand information on this car. I found out about it through "The Colorado Time-Table" but haven't tracked down the issue just yet. It seems that this car went through quite a few changes over the years. Here is the history from the references that I have. According to Colorado Rail Annual 24 it started life as a baggage car in the 1-30 series in 1880s. These cars where then renumbered 100-129 during 1885-1886. In 1896 it was rebuilt into a mail, baggage and express car. In 1926 it was put into work train service as 0120. Volume X of the pictorials has a picture of it near Poncha Junction in 1951.