What is the grass on?
The grass is on the train tracks.
    src        edge_attr  dst
0     0   to the left of   15
1     0               by   15
2     1  to the right of   14
3     2   to the left of   12
4     2  to the right of   16
..  ...              ...  ...
58   18   to the left of   14
59   18   to the left of    9
60   19               by    7
61   20  to the right of   12
62   20  to the right of    9

[63 rows x 3 columns]