Jake is correct. I believe last spring it underwent a 1472. It has been rebuilt numerous times prior by Strasburg. I've ridden behind it and photographed it many times. I was unable to make it to Strasburg this year to ride the freight train but will make it a point this year to do so.
Strasburg is also currently rebuilding their "original" steamer, ex CN 0-6-0 #31 on a time permitting basis. Strasburg will be hosting a "heritage days" event this year on their anniversary. The original #1 Plymouth will pull two of the original cars in the fleet, a total recreation of the trains SRC ran in their first years before steam. I'd like to get to that! Who knows if/when they would ever do that again!