Energy from breaking wind

At some point in time you have (I hope) run around with a little paper fan, which, to your amazement and joy was turning around.
Now lets extrapolate and use this basic theory on converting the wind energy created by a moving vehicle. The sceptic will jump in at this point and say trying to harness energy from a fan/turbine on a moving vehicle will reduce the energy efficiency and aerodynamics of the vehicle. Fine. To this sceptic we will consider a less aerodynamically shaped vehicle – Say a UPS bread box shaped delivery vehicle, a bus, or in more practical terms a railway train.
The train travels at an average speed of about 80kmper hour. (As a general rule, wind generators are practical where the average wind speed is 10 mph (16 km/h or 4.5 m/s) or greater.) So we seem to be traveling at a more than appropriate speed for the conversion of wind energy. The wind directed through funnel with a wide mouth can be directed onto rotor blades that turn turbines that produce electrical energy The energy thus collected can be used not for running the train (still keeping the skeptic happy) but stored in batteries and used to run airconditioning, lighting, and maybe the engine of the train at cruising speed. It could cover all the electric needs of a train except direct propulsion. On a train or a bus a number of air intake inlets can be created even on the sides of the vehicles which are directed to a number of rotaries (fans) in a continuous series. The idea being that the wind need not turn just one fan but as it passes on it goes over the next and the next and so forth till it is let out behind the vehicle. The fans are then connected to turbines or electric motors.
The vehicle should have an alternator to balance between fuel driven power/ battery charge and wind created electricity.

This is just the basic format that can be developed and fine tuned to generate suitable amounts of electricity