Reply to "4x10 Fastrack two-track main with O44.5 outside diameter"

The inside figure-8 curves (and forming the reverse loops) are O60 and O72 turnouts, with O60 curves.  Nice and gentle as trains ease around - less chance of locos and cars bumping off the rails over the crossings at speed, with only moderate force from the drag of a long train reversing direction because of these wide curves and turnouts (wide for O36 and smaller equipment anyway).