Does the train look modern?
No, the train is vintage.
    src        edge_attr  dst
0     0  to the right of    3
1     1   to the left of    3
2     1   to the left of    2
3     2  to the right of    1
4     2  to the right of    5
5     3  to the right of    5
6     3   to the left of    0
7     3  to the right of    1
8     3   to the left of    4
9     3   to the left of    6
10    4  to the right of    3
11    4   to the left of    8
12    5   to the left of    2
13    5   to the left of    3
14    6  to the right of    3
15    7               of    2
16    8  to the right of    4