China was notably one of the last places on earth to retire steam locomotives from revenue service, only ending mainline steam in 2005 and reportedly ending the last branchline’s use of steam in 2023, but may still have some revenue steam service surviving elsewhere

Bosnia still has some revenue steam service at a coal mine (notably running locomotives built by Germany using prisoner labor during WWII that were designed to use minimal resources and with a design life of only 10 years)