Europe’s new rail innovation is the solar equivalent of a Good Morning Burger. We take two miles of Belgian high speed rail tunnel, soak it in rich creamery butter, and then we cover it with a shelter to protect it from nearby old-growth trees, eliminating the need to cut them down. Then we top it off with 16,000 solar panels. We call it Europe's first "solar tunnel."

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"For train operators, it is the perfect way to cut their carbon footprints because you can use spaces that have no other economic value and the projects can be delivered within a year because they don't attract the protests that wind power does," said Bart Van Renterghem, UK head of Belgian renewable energy company Enfinity, which installed the panels.