wrote:
A solid sail as wind turbine could also work but probably much slower
as z shaped rails. The extra distance is nice as it generates more
energy.


Slower in speed along the Z-rails, perhaps, but not made
good from station to station.


The spring-flywheel should be able to store enough of the collected
energy. The train should have many of them. The build-up momentum
should be stored at the train-station (some how).

http://gabydewilde.googlepages.com/spring-flywheel

I expect the wind to be either much to strong or to weak.


Sure. When is it otherwise?

Should it try to keep the schedule or aim for peak performance?

What kind of sails would give the best overall performance in an open
area?


Why not use the sails as a wind turbine to drive a staionary
generator, that way the vehicle can be lighter & more
streamlined, and powered by electricity which can be
efficiently transmitted over long distances. No z-shaped
rail routes.

DSK