Are there fences or trains?
Yes, there is a train.
    src        edge_attr  dst
0     0  to the right of   20
1     1  to the right of   28
2     1  to the right of   25
3     1   to the left of    3
4     1  to the right of   24
..  ...              ...  ...
82   31   to the left of    7
83   32   to the left of   26
84   32   to the left of   11
85   32   to the left of   27
86   35  to the right of   21

[87 rows x 3 columns]