The EMD SW9 is a type of diesel-electric switcher locomotive built by Electro-Motive Division (EMD) from 1954 to 1966. It features a 1,500 horsepower engine and is designed primarily for switching duties in rail yards and industrial areas. The SW9 is known for its reliability and versatility, making it a popular choice among railroads. With a length of approximately 56 feet, the SW9 can navigate tight spaces and perform various tasks, such as moving freight cars and assembling trains. Many units are still in service today, showcasing the durability of this locomotive model in the rail industry.