The EMD F Series refers to a line of diesel-electric locomotives built by the Electro-Motive Division of General Motors from the late 1930s to the early 1960s. These locomotives were designed for both freight and passenger service, featuring a streamlined design and powerful engines. The F Series includes several models, such as the F3, F7, and F9, which became popular for their reliability and performance. The F Series locomotives were known for their distinctive "bulldog" nose and were widely used by various railroads across North America. Their versatility allowed them to operate in different environments, making them a staple in the rail industry. Many F Series units remain in service today, either restored or used for tourist and heritage railroads.