C41-8W

What is the difference between C41-8W and C40-8W? I just purchased Atlas C40-8W - Union Pacific #9442 with sound. When I surf the internet looking for photos of the real thing, I am founding C41-8W being referenced to this loco number. Any information will be greatly appreciated. [:D] Thanks.

David
Indianapolis, IN [8D]

9442 is a C41-8W. The only difference is horsepower- 4,135 as opposed to 4,000 in a C40-8W. Externally, they are the same.

Thank you Mike for the information.

David