Отчего здесь столько путей?

The situation is now at least as complicated: part of the complex is underground. https://transphoto.org/photo/1265612/?gid=4856 (search "Bara").
In 1964, underground tramway work did not yet exist: a few short tunnels, like this one, had been built in 1958, but actually without any stations.
The complexity has remained about the same: trams have to leave in different directions. There were also many more tram lines then than now, and an added bonus: this complex was built on the occasion of the 1958 World Expo.
https://transphoto.org/photo/1094758/?gid=4856
Now, just 2 tracks exists. https://goo.gl/maps/Xqketw6jtTYf2Vse6
Just 1 route (81) is coming here, many other routes runs underground.