>>2005166Here, have a list
https://en.wikipedia.org/wiki/Steam_locomotives_of_the_21st_centuryWith regards to the UK projects, some are scratch builds or mostly scratch but using some original or similar parts, and some are conversions of other locomotives, however more new builds are going to be needed over time as original locomotives continue to age, be worn out from use, and require more and more replacement parts to keep them operational. There's a Ship of Theseus argument about preserved locomotives with some people believing that they should be pulled from traffic if keeping them running requires the replacement of too many original parts, while the counter argument is that parts and fittings were routinely swapped between locomotives during their working lives and barely any made it into preservation with all of their original parts.
Regardless of which way this argument goes, the skillsets needed to produce replacement parts or new locomotives need to be retained, especially as the original generation of preservationists who carried over the knowlege from the steam era continue to die off. There are younger folks being trained to replace them, but if those people are going to be sustained there needs to be enough consistant paid work for them for keep doing it, and new build projects can potentially play a big part in that. The problem is finding the money to do it during a time where rail preservation is increasingly struggling to remain financially viable.
