There's a problem with this sort of thing. You've done a nice interpretation of the 1970s "color scheme" on a modern locomotive, but the Penn Central, if it had survived, might well have changed its stripes, so to speak. The Penn Central was born and died at about the low point of the American railroad industry's economic fortunes, and its extremely austere locomotive paint scheme reflected this. (My memory is a bit hazy, but I THINK I remember a Penn Central spokesperson, about the time of the merger, reassuring the investment community that the new management wouldn't waste money on repainting all the locomotives and such!)
Conrail was born to this scene. It's original paint scheme was as austere as PC's, just substituting blue for black and a canopener for the mating worms. BUT, as the 1980s drew on and Conrail's (& the railroad industry in general's) fortunes improved, locomotives got more colorful. Even Norfolk and Western, whose locomotives were as plain as PC's, added graphics and speed stripes after its merger with Southern! Conrail added a white stripe along the frame with, I think, a 1989 or 1990 GE order.
Obviously, we have no way of telling what PC would have done if it had continued as a separate company. (Speaking as a philosopher with an interest in the logic of counterfactuals, I'm not sure the question even HAS an answer!) But it seems plausible that it would have livened up its image. Not, perhaps, to the extreme of BNSF's multi-striped scheme(s), but at least as much as late Conrail.
So, historically inauthentic as it may be, I'd like to see a modern PC locomotive (as a GE fan I'd rather have an ES44 than an SD70-2) with a frame stripe and... Something imaginative and high-visibility on the nose. And maybe the PC website address beneath the name on the long hood!