Ok take CSX's first GE-AC6000CW, do you really some one at CSX got the hair brain notion to say, HEY lets put this thing in a museum, we have money to burn. Which to be honest is fine with me. I had the chance several years ago to take pictures of CSX's AC-6000 numbers 600 and 601 with the GE test car spliced inbetween them as they went through Jacksonville Florida. Let me tell you, see those two out on the main line was a sight to see. Further I really don't think the designers at GE and EMD have the railfan in mind when sit down to work on their latest creation.
Guys face it, it's a money issue.
If I was in the position of CEO of a mega railnetwork you would never see me place my newest locomtive in a museum or on primary excursion service. I have nothing against either one, but lets get seriuos for minute. Now their are several museums out there who have an impressive line motive power and rolling stock. Most of which even I as a modeler would be happy to own. I have the privaledge of naming names.