So, almost 1 1/2" scale? For a couple decades I was the proud owner of a 1.6" scale SP Harriman light Pacific, complete with brass 100-C-9 tender and neat little brass marker lamps. Sold it last month.
I love marker and class lamps - and am a total SP freak. However, I just use white or green on the locomotives, and red and amber on the cabeese - sometimes red and green.
The Mogul is one of the classic SP locomotives - I actually pulled the throttle on an M-4, but prefer the lines of the M-6.
Nice caboose, but so far, I have not seen one like that behind an SP Mogul. I intend to get a copy of Tony Thompson's Caboose book soon, so may be able to make a more intelligent guess later.