John, agree. I would be content with a painted, but unnumbered SD45. Let me number it the way I want, to match a particular engine I saw at Donner, San Timeteo Canyon, etc., in the 70s. But then, it is becoming increasingly hard to find O Scale decals anymore. I have a fairly robust supply of Champs and MicroScale, but I can't replace my inventory when I use them. So I'll have to accept what the manufacturers provide me. I just don't know how expensive it would have been to make #7399 as you suggest, and I constantly remind myself that all our manufacturers have to pay their employees...keep the lights on...and hopefully make a profit. For the same reason I patronize my LHS as much as possible, especially for the big ticket items.
And then I'm not getting any younger. So when I run #7399 it will bring back pleasant memories of Joy, Kansas, and the Cotton Rock.
And I certainly agree that MTH did a top notch job on those Tunnel Motors. I have all the variants, powered and non-powered, and even swallowed my fondness for SP and got one of the UP painted variants. Fortunately I lensed one at Norden in August '98 in helper service.
I see that you're a member of the San Diego group. I was stationed out there '73-83, and have fond memories of the original HO club in the House of Charm. I use to proudly run my custom-painted 11-car HO Northern Pacific "North Coast Limited" (AHM cars with a ConCor Slumbercoach, powered by a A-B-A set of Atheran F7s re-powered with can motors) with with a gentlemen that was running Z-6 Challengers, etc. When I got back from a nine month deployment in '76-77 it was gone due to the fire, but my family and I made the Electric Building a "must see at least once a month" occurrence when I returned one final time to San Diego '87-89.
You guys are doing great work for the hobby, and I'd be a member if I had retired out there. You have the Fleet and a great climate. I have the Pentagon...and lots of heat and humidity...but I also have a basement!
Sail safe!