Over time I noticed that the Lionel Hall type locomotives had different stated minimum curves. From various sources I gathered Hogwarts and Victorian Christmas were O-36, Kinlet Hall was just listed as "Traditional O Gauge" and Albert Hall was listed as O-31.
This made me curious as to what was different about their design. I would think it would be the steam chest, but from looking at the parts for them, they all reference the same part; 7101069024, STEAMCHEST/HOGWARTS LOCO.
I emailed Lionel about Hogwarts and Albert Hall, asking what the minimum curve was for them, and if the min curve was different, then what was the design difference between the two locomotives. Lionel customer service emailed back that they should both navigate O-31!
Does anyone have any idea what is really going on? From the forum posts it looks like the real min curve is O-36.