An interesting idea for the roof of the train tunnel.
The high-speed line running from Paris to Amsterdam passes the city of Antwerp and a nearby ancient forest. To avoid the need to fell protected trees, a long tunnel was built over the line which has now been topped with 16,000 solar panels watch the video flyover. The electricity produced by the panels will be equivalent to that needed to power all the trains in Belgium for one day per year, and will also help power Antwerp station.
