line 4 

line 4 started construction on december 31, 2014. the line opened on 26 may 2019 with 25 stations. another change was a new electric start system. the first car slid into the first floor parking garage and as a result took days to remove, while the second slammed into the corner of the building, being crushed against it by the weight of the remaining cars. the school in his home village is called in his honor. though no documents are known to discuss this feature, it is not likely to be an accident. the keystone weighs about three tons. 