The Boeing B-50 Superfortress is a post–World War II revision of the Boeing B-29 Superfortress, it was fitted with more powerful Pratt & Whitney R-4360 radial engines, stronger structure, a taller tail fin, and other improvements.
This had the same engines that pushed the B-36.
To distinguish it from the B-29, this was the Super Fortress, not Superfortress. My dad's favorite plane and engine! I have a picture of him standing in front of the B-50 at the Castle Museum in Atwater, California.