The sail propelled train is now in operation...

[Externet]

In Brasil, put to work for moving people at an airport .

 

Interesting concept, the sail is exposed to air flow in a duct under the train, its 'mast' riding on a slot.

 

Enjoy ----> http://www.aeromovel.com/technology.htm

[Klaynos]

Are you familiar with Brunel's atmospheric railway? Worked well if it wasn't for the rats...