Is that a train or a truck?
That is a train.
    src        edge_attr  dst
0     0   to the left of    7
1     0   to the left of   15
2     0   to the left of    1
3     1  to the right of   16
4     1  to the right of    0
..  ...              ...  ...
56   19  to the right of    6
57   19  to the right of   11
58   19  to the right of   14
59   19   to the left of   13
60   19   to the left of   15

[61 rows x 3 columns]