I know I'm late to the party on this thread, but I am stunned.
At first I thought that this would be a simple removing of the Lionel shell and adding the Williams Dreyfuss one, but looking it over carefully, this is one heck of a special project. It's almost like hand streamlining the real locomotive. Looking over the engine and tender, I can see a lot of really specific details were put in with a lot of effort, though the familiar US Lionel moldings can be seen in small areas (in a good way). The decoration and weathering really completes the picture. It really looks like something Lionel would've made in the mid/late 90's (I wish they did) with the added benefit of extra hand details.