Dynamic braking on diesel-electric locomotives

The increasing prominence of the diesel-electric locomotive on American railroads has given new impetus to the use of dynamic braking. Originally intended as a means of controlling both passenger and freight train speed on mountain grades, it has been refined to the point where it is increasingly used for controlling freight train speed in relatively level territory. A recent refinement of braking control takes advantage of additional traction motor capacity available at lower speeds. Extensive service tests have demonstrated the operational and economic value of this form of braking.