EMD GP30

The EMD GP30 is a four-axle diesel-electric locomotive built by General Motors' Electro-Motive Division (EMD) between July 1961 and November 1963. A total of 948 units were built for railroads in the United States and Canada, including 40 cabless B units. The GP30 was the first of EMD's "second generation" of diesel locomotives, and it introduced several significant design changes.

One of the most noticeable features of the GP30 was its high, bulbous carbody, nicknamed the "pregnant GP" by some railroaders. This was designed to house the locomotive's increased electrical equipment and air intakes necessary for the improved 2,250 horsepower (1,680 kW) 567D3 engine. The GP30's design aimed to provide increased horsepower and improved reliability compared to its predecessors.

The GP30 was a successful design and helped EMD regain market share from competitor General Electric. Many GP30s remained in service for several decades, undergoing rebuilding programs by their original owners and later operating for smaller railroads and industrial companies. Several examples have been preserved by museums and historical societies.