Cotton Belt's fleet of passenger diesel had an impressive variety for 9 units.
PA-1 301-302 (to SP 6067-6068) SP Daylight scheme with silver roof, COTTON BELT lettering
FP7 330 (later 306) SP Daylight scheme with ST.LOUIS SOUTHWESTERN (as built) or COTTON BELT (after a wreck) and finally SP Bloody Nose.
GP7 304 only geep in SP Daylight scheme to black widow
RS-3 308,309,310,313,314 Last two delivered in switcher black and orange, later got black widow, 308-310 delivered in black widow. 311(second) was equipped with S/G controls and piping, but no S/G, so it could be used in passenger service for power only. All units set up long hood forward. Lettered StLSW before mid-150s, Cotton Belt after. SP/T&NO did not have any RS-3s. Renumbered into 2800 series in the 1964 renumbering.
Thanks to http://espee.railfan.net for all of the info.