OK - GM&O colors: I'm in the GM&OHS (you should ALL join, BTW; NYCSHS, too) and
am a former employee, though the Alton scheme (the red/maroon) was almost extinct by the time I came along.
The GM&O reds varied a bit from shop to shop, and between what are now termed
"North End" (St Louis to Chicago and KCMO) and the "South End" (St Louis to
Mobile and New Orleans), as did some frame colors.
North End: tended to be darker and more maroon; the light stripe approached a reddish
orange early on. The maroon was almost brownish at first. Switcher frames and steps tended to be black
South End: more red, little maroon - really a two-tone red scheme. Switcher frames/steps tended to be red, also.
My MTH RS3 is dark, and correct for the North End. The Atlas RS-1 is red, and correct for the South End. The colors traveled, as a darker loco painted in Bloomington
was not re-painted just because it was re-assigned to Mobile. But when it was,
it usually got redder. The gold-outlined red stripes disappeared with time too, as plain red or maroon is cheaper to do.
But the South End Alco FA-1's NEVER lost their fancy striping.
MTH's RS-3 has a nose-problem (not a GM&O issue; for all of them): they are
improperly shaped - too flat. Bugs me. Lionel's low-end RS3 body is shaped correctly.
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Passenger Train Collector - MTH has made a 5-car scale HW GM&O set; I have it. The
red window band is probably a little darker than it "should" be, but the set is gorgeous.
Atlas and Weaver have produced GM&O passenger sets/cars. MTH has also offered
a GM&O DL-109 and lightweight passenger set in the earlier, "pre-Alton colors" red
and silver. Very different look, but just as good-looking. Of course, Lionel offers the
Alton Limited, the cars of which are GM&O colors - because the GM&O bought the
Alton (former Chicago and Alton) after WWII and adopted the Alton maroon and red paint scheme to replace the silver and red. There were some heavy Pacifics painted in a version of the red/maroon (plus black) and used in high-speed freight (and passenger) service. The GM&O kept the paint scheme, put "GM&O" on the coal bunker, and added "The Alton Route" to the tender sides. These were North End locos.