So I got 2 Williams NW2 locomotives. One is “older” and one is “newer” the older one I believe is from 2004 and the new one -13. Anyways the new one had prime mover sound with true blast plus and the older one had the true blast 2 with horn and bell. Well tonight I pulled that out and swapped it for a TBP for a GP30. Figured it was close enough as they basically have the same engine. The darn thing sounds great!! It sounds even better than the other one and that one sounded pretty good. It’s actually pretty throaty! I couldn’t use the speaker that came with the TBP as it wouldn’t fit anywhere so I just left the speaker from the TB2 in there and wired it up. Pretty darn happy with the results!!!!!