Diesel trains are locomotives powered by diesel engines, which convert fuel into mechanical energy. They are commonly used for both freight and passenger transport due to their efficiency and ability to operate on tracks without the need for electrification. Diesel trains can be found in various configurations, including diesel-electric and diesel-hydraulic systems, each offering different advantages in terms of power and maintenance. These trains are known for their versatility, as they can travel long distances and operate in remote areas where electric trains may not be feasible. Additionally, diesel trains are often more cost-effective to run, making them a popular choice for many rail operators around the world.