No its not in game, Dovetail themselves probably wont add it due to their licensing issues with BNSF, only way one would make it in game is if a 3rd Party Developer makes it officially or unofficially.
Well from what I've heard, BNSF only wants content with their branding in or on it to be released in America and America only, which is honestly foolish and senseless once you start to think about it. I haven't heard anything about BNSF flat out telling DTG they can't make anything with their logos and brandings. It's most likely more of a case that DTG just doesn't want to make BNSF branded DLC that can only be sold in the States and not internationally.
Seems odd how that restriction applies to DTG, but not other train simulator owners like N3V (Trainz) or Run8...