Nice build job on that hopper. Glad to hear you ditched the fragile plastic grabs and went with wire.
The weathering on the car is very well done. One point on the wheels though: the wheel discs should not be rusty. Rust forms on roller bearing truck wheels because the bearings don't leak. With friction bearing trucks, the wheel discs should be a greasy black color from the waste oil lubrication leaking from the bearings. Google "friction bearing trucks" and check the "images" for lots of prototype photos.
