What kind of vehicle is crossing the white pole?
The vehicle is a train.
    src        edge_attr  dst
0     1   to the left of   17
1     1   to the left of    3
2     1   to the left of    2
3     1  to the right of    4
4     1  to the right of    7
..  ...              ...  ...
86   19   to the left of    9
87   19           behind   16
88   19   to the left of    3
89   20  to the right of   15
90   21   to the left of   16

[91 rows x 3 columns]