
You first need about $2,400,000 US-Dollars...that's twenty-four hundred-thousand dollars for a GEVO-AC unit...a little less for a DC-traction model...
GE-Transportation will not paint a client(UP) paint styling on the unit, as per contractual agreement with Union Pacific Railroad.
...however, an outside shop...or individual...may be contracted to paint the thing into whatever you wish...you would simply not be able to operate as a business with the Southern Pacific or any other copy-written styling...
The the first most popular question to be asked by most anyone that cared would be "Why not EMD?"
You could for example catch a used SD40, the "Most Popular Locomotive In The World" for about $300,000...NS has two high-nosed fallen flag units right now in Juniata, one NW the other former Southern Railway System...they could be had for possibly a little more that scrap value...that is $steel-scrap price...to the right buyer, a museum or otherwise...and they have more every day!
I know you have no "backyard" that can handle locating the "asset." Participation in a railroad historical society such as the California Railroad Museum can open you to worlds of trains that have yet to be realized as well as a "captive" roster they already have!