Is this a bus or a train?
This is a train.
    src        edge_attr  dst
0     0  to the right of    7
1     0   to the left of   10
2     0   to the left of    9
3     0   to the left of    1
4     1   to the left of    9
5     1  to the right of    0
6     1   to the left of   10
7     3               at    4
8     5               at    4
9     5        parked at    4
10    5               in    4
11    7   to the left of    0
12    9  to the right of    0
13    9  to the right of    1
14    9   to the left of   10
15   10  to the right of    1
16   10  to the right of    9
17   10  to the right of    0