Fair comment, though in real life the space near the tracks is either non-existent either uneven ground filled with rocks and plants, but as other pointed out it could be on roofs, parking lots, etc. Also, apparently the SNCF says they are specifically testing how much it complicates maintenance, so they are aware of this, but even then it's less direct to test for that, and maybe built it in the future, than to built it in already adapted places.