I was down in '01 and '04 for ECLSTS. And did not take in this attraction, probably since it did not pop up when I was searching for railway themed attractions. I presume it was open (almost) year round ?
After landing at HarrisburgInt’; '01 I went west to Altoona, '04 I popped up to Scranton and according to google maps when southbound I would have been close to Shartlesville on #78, but instead I went south past Allentown and Reading to Lancaster/Strasburg.
In the vid mention visitors take less than a couple hours, I would have likely been there for twice as long LoL
Another Utube vid with narration by the granddaughter;
https://www.youtube.com/watch?v=Vrql0GF-F7c
Oh well ya don’t get to see everything in life 