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Mimic vanilla RCT2:

- If the isolated track is the last piece on the ride, delete and
set the construction mode to a straight piece. Rotate said piece
45 degrees anti-clockwise.
- If other track still exists, delete and rotate as above but
set the track type to station-platform.
- If banked, set track type to the turn that entered the previous
orientation. For example, north west banked track would continue
with a banked 45 degree turn starting facing west.