Hi Russ,
The B&O 25 was pretty special because until very recently, she was not only operable, but actually had an FRA Form 4. The work was done 15 years ago by the Strasburg Railroad, so she could be used in the movie "The Wild Wild West", which was a re-creation of the 60s TV series. That's why I was a bit shocked to learn of the crown sheet issue. I don't believe that her current boiler was the original one though. In fact, most 19th century engines that are still running were probably reboilered at some point.
Other non-wood-burners include the Sierra #3 (1891, reboilered), Calumet & Hecla Mining #3 (1873, boiler status unknown), WW&F #9 (1891, reboilered), SP 2248 (1896, boiler status unknown), Detroit & Lima Northern #7 (1897, boiler status unknown). I'm sure there are a few others.....probably damn few.
/Kevin Madore