I have not, actually, completely wasted today, despite having the most tenuous grip on the vertical, and a splitting headache all day.
I have been researching. I have found almost all the logos on Caboose's costume (ok, one I've only got in red not green, but that's what colorise is for!) So now I know what they are, and can blow them up and print them off at high resolution. Or something.
Incidentally, tour Pearl has PRR mongrammed on her belt... the same logo as Caboose in Bochum has on his centre chest... it's the Pennsylvania Railroad logo.