U36B Diesel Locomotive

Prototype Information

The GE U36B debuted in 1969 as the final and most powerful four-axle road locomotive in GE’s Universal Series. Rated at 3,600 horsepower from the FDL-16 engine, it pushed the limits of what railroads could reliably do with a B-B wheel arrangement. GE marketed it as a fast-freight locomotive for railroads that wanted high horsepower without moving to six axles.

Sales remained limited because most railroads favored C-C units for heavy freight, but a few major lines—most notably Seaboard Coast Line and later Seaboard System—operated U36Bs in large numbers. The model stayed in production until 1974, when GE shifted to the Dash-7 family. Most units worked into the early to mid-1980s before retirement, marking the U36B as a short-lived but ambitious end point for GE’s high-horsepower four-axle U-boats.