Power type Diesel-electric Safety systems Leslie S3LR | Builder EMD AAR wheel arr. D-D | |
 | ||
Gauge 4 ft 8 ⁄2 in (1,435 mm) standard gauge | ||
Union Pacific 6936 is an EMD DDA40X locomotive owned by Union Pacific Railroad (UP). It is the sole example of the "Centennial" type that is still in operation, and thus is the largest operational diesel-electric locomotive in the world. It is occasionally used on both excursion trains and in revenue freight service.
In the early morning on November 30, 2000, UP 6936 struck a dump truck at a grade crossing in Livonia, Louisiana and suffered significant damage to its front end. An employee riding in the nose section was killed in the accident, as was the driver of the dump truck. After the damage was repaired, a winged UP shield logo was applied to the front. It was also repainted in the current Lightning Bolt paint scheme and had a rooftop air conditioning unit installed.
Another collision occurred in 2007, but there were no injuries.