R&N 40th Anniversary Engine on the Pittston Train

We were heading up to Steamtown hoping to nab shots of 26 (we didn't) and on the way up we were able to see R&N's Pittston to Jim Thrope Train. That set's really gotten popular since the last time we saw it less then a year ago. It only had 3 cars then.
The faculty behind the wooden framed boxcar in it. Where the hell did that come from. Gotta be over 100 years old at least... kinda want it