You wont find the trains they use to advertise 2010 in Trainz 2010. 
Its misleading advertising. I have never found them either and when I asked on the forum where to find them  my question lasted a day before it was removed
		
		
	 
Video One: 
   UP BigBoy Kuid: 523:10070
   Ocemy's CHN DH11   (could be #0018 or #0099, hard to tell from a video - I suspect 0099 though, as it's prettier slightly)
   V41 522 Kuid: 109628:83
   Ocemy's CHN ND5-1 (GE C36-7) Kuid: 276266:1062
   MML HST New Kuid: 61109:10118
   AN 830 Class (*2) Kuid:-1:100737
   CN SD40-2 Kuid:-12:3534
   Unknown HST-style train (shown from above, no way to ID)
I can do the other 3 videos if you *really* want, but it's a lot of effort (this took about 20 minutes). The fact is, all of those are built-in to TS2010, so clearly they ARE in ts2010.
Edit: Other 3 videos don't feature nearly as many locomotives, so...
Video Two:
   CR GM Class (*2 back to back) Kuid: 2512:2374:7
Video Three:
   BN SD40-2 Kuid:-12:3537
   ATSF SD40-2 Kuid:-1:100871
   CHN ND5-1 (GE C36-7) Kuid: 276266:1062   
Video Four:
   UP SD40-2 Kuid:523:156564