Welcome back Xero. I'm not familiar since when you were last around, but if you're looking for US content, JointedRail.com has grown into one of Trainz's largest providers of amazing quality content both freeware and payware. The locomotives you seek can be found here http://jointedrail.com/index.php/payware/class-1-s/csx.html?limit=all.
I saw that they do not have any CSX AC4400CW. Will world of trainz content in Trainz 2012? Before my laptop was stole, I had 2006 with a lot WOT content.
I'm sorry, I'm not familiar with CSX and after re-reading your post and a google search it appears JR does not have the paint scheme you seek. I infer from the postings of other TS12 users that WOT content needs alot of fixing to work error-free in TS12 as they are quite dated.
