As far as I know, the Intercity livery was never done on the loco. If anyone has done it, it would only be for personal use as I don't think the license allowed any of his stuff to be distributed by others.
If you search the forums for reskinning, you should find lots of advice as to how you can do this yourself. It may sound daunting but in Trainz terms, it's actually one of the simpler things you can do yourself.