Hmmyeah, but the result is so-so, it experiences a few troubles in the warmest days of the summer and trains (especially high-speed trains who both need perfect

Hmmyeah, but the result is so-so, it experiences a few troubles in the warmest days of the summer and trains (especially high-speed trains who both need perfect rails and put more strains on them) have to be speed-limited or in a few cases even cancelled.