Information is at best sketchy on the C&S cabooses. According to the UP Boston Journals, these cabooses were built by the UP at Armstrong (the KP Shops in Kansas City). There are no numbers listed, just so many cabooses built for the DSP&P at Armstrong. My notes are a couple of miles away. All of these waycars were built with flat roofs and modified into their cupola variants in succeeding years. There are no builders plans that I know of and the only things that seem to exist are refugee plans that escaped destruction by the C&S when they abandoned the 3' gauge. After all of the years of service, no two seemed to be alike, some had square corner posts, some curved, some had portholes in the Cupolas, some did not, some had center cupolas, the majority (at the end of operations) did not but had the end cupolas. If you look at the 1009 and the 1006 you will see variations in them as well, as the 1009 is a longer caboose, as was 1000.
Rick