Service connecting branches of 4/5 Lines
The only two-tunnel connecting branch for today. For 17 whole years, from the end of 1991 to the end of 2008, it was used in regular passenger traffic, connecting 4th Orange Line and the upper half 5th Purple Line.
There is less material in the Network on this connecting branch than on the others. It is known that it has a complex shape with two multidirectional curves, the letter S, and the direction of movement eventually changes by almost 130 degrees. The trains here always ran slowly and literally with a creak ;)