What vehicle is that?
This is a train.
    src        edge_attr  dst
0     2  to the right of    6
1     2  to the right of   16
2     3   to the left of    5
3     5  to the right of    3
4     6   to the left of    2
..  ...              ...  ...
70   18   to the left of   15
71   18   to the left of   11
72   18   to the left of   17
73   18  to the right of   14
74   18  to the right of    7

[75 rows x 3 columns]