These are the “Big Guys”, the primary love of many railfans. These are the restored steam engines that pull full length excursion trains out on the main lines of Class 1 railroads. Differentiated from tourist line steam engines, these engines are generally classy looking, fully operational, well financed and meet all the federal laws to operate commercially on the class one railroads. This is a small list and there are a few engines that qualify for this list but run less frequently than the others, and escape my memory as I compile this list. I will add them to the list as I remember or run across them again. The Federal Railroad Administration maintains strict laws for the operation and safety of steam locomotives in the modern era. Rules promulgated in 1999 take up 90 pages in the Federal Register. See the link: here. The rules include stipulations for 31 day, 92 day, and annual inspections as well as a 1472 day (4 year) boiler inspection which includes a full tear down and rebuild of the boiler. In addition, insurance cost are astronomical. Logistics of fuel and water need careful thought and many unanticipated other things can throw up roadblocks, but railfans and corporations continue to fund these magnificent machines with donations and high excursion ticket prices because they love steam.
The list below is in no particular order and is by no means complete. I can't remember them all. Senility is fast approaching, (help me here, If you know of a qualifying locomotive not listed here please let me know. See my contact page)