IPO are  keys which control animation curves. The original concept of this tutorail is to use these keys to control  "at sight" the  changes of the shape. The idea comes from two excellent tutorials , The  Cave of Thorsan A and A Ride through Mine.

1. The original profil

We start on with the generating of a NURBS curve which will be the track/profil.

For that we use the menu Surface  >> Curve.

We tap twice  TABKEY for record the curve ...

...and we modify  this curve  until  convenience.

-- In this particular case, some vertices  have been added.
-- The set of vertices have been selected by AKEY,
-- Copied with Shift-DKEY,
-- Reversed with SKEY>>XKEY>>LeftMouseBut.
-- The two curves will be connected by selecting two opposite vertices  and tap FKEY
-- The other side will be closed with same selecting and CKEY

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