Is there either a silver train or fence?
Yes, there is a silver train.
    src        edge_attr  dst
0     1   to the left of   20
1     2  to the right of   18
2     2  to the right of    3
3     2  to the right of    7
4     2  to the right of    5
..  ...              ...  ...
60   18  to the right of   14
61   19  to the right of    4
62   19   to the left of   16
63   19   to the left of   12
64   20  to the right of    1

[65 rows x 3 columns]