Solar panels between railway tracks?

After long delays, the removable PV system will finally be tested on a western track next spring.

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).

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The 600000 € probably include the development cost. Thus, on a larger scale, the cost per unit length will decrease significantly.
- True, but it still seems rather excessive....
  
  That's like 1/7th of the cost of a single passenger car. I'm sure they can easily afford to take that hit if it doesn't end up panning out.

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