It can't be done w/o custom cutting two pieces of straight track to replicate the length of each crossing section respectively. You can demonstrate this by using two crossings in the plan either stacked, or offset from the center for overlay visibility, without tracks connected to the 90ยบ stubs.
None of the manufacturers made these "makeup" sections(7.38" for O-27, 8.31" for "O"), which would have also simplified reverse loop construction.
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