BNSF Fan, the rivet counter in me just exploded when I saw the "Rio Grande" caboose... In 2016, Rugby, ND was restoring this GN caboose.
What are those small circular shapes that can be seen just below the narrow bay window on SP cabooses?
From 05/16/1993 at Spencer, NC, SOU bay window cabooses are out of work. The X531 found a permanent home at the W.P. Jones Park in Duluth, GA.
From 03/02/1985 at Selma, AL, SOU cabooses in service. SOU hacks with yellow bay windows denoted that they were for local use only. I think they lacked built in radios.