What is the mpg of a diesel train?

The fuel efficiency of a diesel train is typically measured in terms of gallons of fuel consumed per mile rather than miles per gallon (mpg). On average, diesel trains may consume about 0.5 to 1 gallon of fuel per mile, which translates to roughly 2 to 4 mpg depending on the train's load, speed, and type of service. Factors such as track conditions and train design can also influence efficiency.