I'm searching everywhere online, but I can't find out if Southern had any GP9 Torpedo Tube locos. I thought I found one, but it was a GP7 TT. Does anyone here know? Photos would be great! Thanks.
Not sure about GP-9s, but SOU did own SD-24s with torpedo tubes. Torpedo tubes were normally a result of steam generators or larger fuel tanks being added. Atlas made these in N Scale some years ago.
Sure, happy to help. I remembered too that Atlas made SOU SD-9s in N Scale in 2005. Maybe something else to add to your list.