I saw a purple caboose with red trucks sitting in the UP Fresno, CA. yard. It is on the RIP track and unfortunately partially obsured by cars on the team track. It is a wide-vision caboose. It looks like it says Colorado and Southern on it and “The Colorado Road”. Its number (if I remember correctly) is 01523. According to (http://utahrails.net/drgw/rg-cabooses-steel.php), (http://www.drgw.org/data/caboose/caboose.htm), and (http://cencalrails.railfan.net/CaliforniaCabooses.txt) it is formerly DRGW 01523 owned by someone in Clovis, CA. (suburb of Fresno). Unfortunately, it is heavily graffitied. Anyone know anything else? These are the only websites that my search returned.
Ozark Mountain Railcar sold a C&S caboose which I believed was purple. Sorry know additional info but there is a small picture in the middle of the page.
http://www.ozarkmountainrailcar.com/new_page_18.htm
That looks like it. Unfortunately, about half of the side that I saw is now covered with graffiti. I found out it is RLTX 01523.