One of the tricky parts of the illusion of modeling railroading is the need to model mostly plain, common equipment. Exceptions should be just that: not all the time. Many modelers will tell you that you need more plain freight cars than brightly colored ones, and that most of your locomotives should be run-of-the-mill daily workhorses.
Well, right - except in some cases, the prototype had an incredible variety, and there really was an amazing diversity you could see in the operations. The case in point here is the Chicago Line, the prototype for the Onondaga Cutoff. In the Conrail era and especially into the 1990's, it was a busy railroad with much of the traffic coming from interchange in the Chicago or St. Louis areas and headed to Selkirk for forwarding to the New York metro area, or to New England. A quick internet search at www.rrpicturearchives.net gives us a number of examples that appear rather incredible.
Rich Carl captured this power from train CNSE at Selkirk, NY, with a Grand Trunk Western SD40 leading a Conrail, former Erie Lackawanna SD45-2.
On a different day Rich saw this coal train on Conrail at Selkirk with a Santa Fe GP39-2 and a Union Pacific SD40-2.
In February of 1998, former Denver & Rio Grande Western SD40T-2 leads a 'ballast express' C32-8 into the engine servicing at Selkirk, coming off inbound train COSE in this photo by Ed Lewis. Rio Grande, leading across central New York! They're passing a brand-new CSX General Electric AC6000CW locomotive, likely being delivered to CSX via train SECS later this evening.
Collinwood Yard in Cleveland, OH hosted an amazing variety of power in this 1993 photo by Alan Gaines. The Santa Fe C30-7's and P&LE GP38 are awesome, but so is the shop switcher in the background - a Conrail GP30, moving a brand new SD60M around the shops. Wow!
And we have two more Tom Beckett images to finish it off, both from 'Bens Bridge' in Selkirk in January 1994, showing locomotives from no less than 6 railroads in one view above and a closer zoom below. The variety is almost absurd and would be criticized on a model railroad as a fantasy.