They can and maybe they should. They will have to do a little work on them and maybe a lot of work rebuilding the loco but it can be done. As a PS player, I’ve not had the pleasure of using the GP40-2 as it was never available.
Even if not the same model as the TSW2020 one. The GP40-2 shares the same frame as the GP38-2. It uses the same prime mover as a SD40-2. It wouldn't take much work to get one back into TSW2/3 if DTG wanted to.
Excellent idea and why not bring them in BNSF Paint with SD70ACET4 Steel Coil Cars alt paint versions CSX and Union Pacific.
As far as i remember, the GP40-2 was only ever available as part of the Train Sim World Deluxe Edition Bundle(the first ever release of the game on console). Still have it in my Downloads but a huge bummer that we can't use it in TSW2 or TSW3 :/ Cheers Edit: This was the official description on the PS4 Store page back in the day: Digital Deluxe Exclusive Includes CSX GP40-2 Bonus Loco CSX continues to employ a large fleet of veteran GP40-2s in road, local, and switching duties across its system. And, the successful Electro-Motive GP40-2, in classic CSX “YN2” and modern “YN3b” liveries, joins the GP38-2 as authentic motive power to move tonnage over the Northeast Corridor New York route!