Nice model, but the whistle is from a Pennsylvania Railroad J1. (The proper whistle can be found on Railworks America.) Textures are a little sloppy, but it's not too bad. The biggest issue for me is the WWII scenarios don't match the model. In 1947, the PRR "modernized" the K4 fleet. This DLC models the "modernized" (post war) K4... however the WWII scenarios take place before 1947, so the locomotive should be modeled to look like the original (pre war) K4. The most noticable difference between the two was that the headlight on the pre war K4 was on the front of the smokebox with the steam generator behind it. When modernization took place, the headlight was located on top of the smokebox and the steam generator on the front, to allow easier access for maintenance. A platform was also added to the front of the smokebox to allow easy access to the generator. In my opinion, I would have payed a little bit more to have both the pre war and post war verisons of the K4, but great DLC nontheless.