If you ever look at the area of track between the rails. You'll see it's covered in all sorts of crap. Oil, lubricants, and all sorts of other fluids fall out the bottom of trains into this space, along with dust, sand (from brakes), leaves, litter, etc... This will all need to be cleaned off to keep the panels operating at peak performance. Except you can't just send a student down with a mop and bucket. You need to arrange track possession, and do all the risk assessment stuff.
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