A locomotive or engine is a rail transport vehicle that provides the motive power for a train.
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Outside the Northeast Corridor and a route in Pennsylvania from Philadelphia to Harrisburg, all Amtrak trains are powered by diesel locomotives, which emit greenhouse gases and fine particulate matter that can cause health problems.
Railfan & Railroad stated in 2022 that the only places on earth to see steam locomotives in revenue freight service are small switching operations in China, North Korea and Bosnia, but that these were sporadic at best. Tourist locomotives are still in regular use.
'Miniature railways' are railways that can be ridden by people and are used for pleasure/as a pastime for their constructors and passengers. In the USA, miniature railways are also known as 'riding railroads' or 'grand scale railroads'.