Steam locomotives of the 21st century
Despite the advent of electric and diesel locomotives in the mid-20th century, steam locomotives continue to be used and constructed into the 21st century. Steam locomotives constructed in the 21st century fall into two broad categories: those that use advanced steam technology to be commercially competitive with diesels; and those built to more traditional designs for hauling tourist trains.
Source: Wikipedia — Steam locomotives of the 21st century (CC BY-SA 4.0)