Eisenbahn-Motoren-Diesel refers to diesel engines specifically designed for use in trains. These engines are known for their efficiency and power, allowing trains to operate over long distances and heavy loads. Diesel engines convert fuel into mechanical energy, which drives the train's wheels, making them a popular choice for both freight and passenger services. The use of diesel engines in rail transport began in the early 20th century, gradually replacing steam engines. Today, many modern trains utilize diesel-electric systems, where the diesel engine generates electricity to power electric traction motors, enhancing performance and reducing emissions.