FWIW, the MTH Big Boy from the 2017 Catalog has more swing than the Lionel Vision Line Big Boy. We had the club layout working for the VL-BB, and I took the MTH BB up, BAM! Hit the tunnel support with at least 1/8" overlap, the VL-BB has about 1/8" clearance at the same place.
I don't take the MTH BB up any more.