Gunny (and others) - do you know the 'vintage' of your six Berks? Were they all in the same release period? It looks to me like - based on a very quick scan of the 2019 version of Greenberg's pocket guide - there were two 'release' periods for the FlyerChief versions (not counting the Polar Express versions): 2015-16, with three locos - 6-47921, -22, and -23, which were Pere Marquette, Erie and Southern road names, respectively; and 2016-17, with seven locos 6-44020 and -21 (Nickle Plate Road), -22 and -23 (Pere Marquette), -24 to -26 (Eire, C&O, Southern respectively). This latter group, in addition to having FlyerChief, are also bluetooth enabled, so they can use the LionChief app. The recent Trainworld offering was the 6-44023.
For the sake of completeness here, the more recent Legacy versions are 6-44123 to -28 (NPR, PM, C&O, Eire, American Railroads and RF&P, respectively).
Gunny - thanks for the 'problem list' (geez not exactly a good QA record) - since I've plunked down my hard earned plastic, I'll have some idea what to look for...
-Rich
