Updating my previous post, I've purchased two locomotives since my Y6B.
1) Purchased sometime in mid or late May, a very nice MTH Railking B&O GP9 with ProtoSound 3. My first PS3 locomotive. Here is a photo. This photo is owned by MTH and was copied from their Facebook Page. It was taken on the layout at the MTH Showroom.
2) Second engine, I picked up just yesterday and was (up until about 10 minutes ago), listed on the For Sale Forum - I decided to keep it. Another GP9, this one an MTH Premier in the Chessie/C&O Colors. While it has PS2 as opposed to PS3, it is highly detailed and my first MTH Premier locomotive. Of course, I'm no stranger to MTH Locomotives and have had many Premier pieces of rolling stock. I still have a handful of Premier rolling stock lying around as well.
Comparing the Premier GP9 with the Railking, they are exactly the same. Same dimensions, just more details on the Premier. See through grates are nice but not something I'd need to have in the future, same for opening cab doors, etc, etc, etc. The real thing I LOVE are the marker lights. Other than a few details, and the fact that the RK is a PS3 and has a different sound set, they are exactly the same. When comparing the price tags, I plan to stick to RK products. Regardless, it is still a very nice locomotive. Railkings are certainly stepping up in detail, each new one I see/purchase gets better and better.
Below is a stock photo copied from MTH's Website.
Already have my sights set on the next one....an MTH Railking Amtrak F40 Amfleet RTR Train set. I've been wanting a Amtrak set for a while and Railkings are hard to come by and with this set available, it is the one to go for. Won't be for a few weeks or a month or so until I pick it up.