PPL Susquehanna Steam Electric Station in Berwick, PA once had a system of Thunderbolt 1000s, and some of which had some unique jailbar grilles, in which the jailbars only went horizontal. This is the only picture I could find of one. Also unlike a normal jailbar thunderbolt, these Thunderbolts were some of the last Thunderbolts produced by Federal Signal (in the mid 80s), installed shortly after the Berwick plant began operating, and from looking at the picture, the jailbars almost appear to be affixed to the screen rather than the horn.
Unfortunately, all of these Thunderbolts were removed between 2008 and 2012 after being replaced by T-121s in 2008, and I have not heard anything suggesting where they've ended up, and have not found any information of any collectors obtaining any of them. (The story of the ATI's pictured can be found in other posts regarding this system.)
Does anyone have any information on Thunderbolts with this unique jailbar grill? Anyone know if they ended up on other 'bolts outside of PPL's system?