I’m all for putting solar panels all over the place, but won’t these get dusty and oily and need loads of cleaning after trains pass over?
Also, costing €623,000 over three years sounds rather expensive for just 100m (although that roughly equates to 11KW).
It’s free real estate and incredibly efficient use of space. If it works, with all the challenges other have outlined - even at a reduced yield - it’ll still pay off.