The EMD GP30 is a 4-axle diesel-electric locomotive built by General Motors Electro-Motive Division between July 1961 and November 1963. A total of 948 units were built for railroads in the United States and Canada. The GP30's were designed to compete with GE's U25B. The U25B offered 2500 horsepower, while the existing EMD GP20 was only rated at 2,000 hp. The EMD's engineering department ended up using a 16 cylinder 567D3 engine that produced 2250 hp for the GP30. They also made several improvements on the GP20 design meant to match the U25B - a sealed airtight long hood, a single central air intake, and easier access for maintenance. These changes required more space behind the cab, and this was achieved vertically by raising the height of the locomotive, providing space for the central air system, the turbocharger, and electrical cabinet. This increased height meant a new body was required. EMD wanted the new body to be modern and updated, so the GM Automotive Styling Center created the GP30's unique "hump" and cab roof profile.