The way between Beresteiska st. and Shuliavs'ka st. is the hardest in Kyiv metro. The slope there of 42 ppm is the highest in Kyiv and one of the highest in the world. That's why the train almost didn't turn on engines on this way. Also, there are many tiobacteries. More here: tov-tob.livejournal.com/102961.html