Are there either trains or cars?
No, there are no cars or trains.
    src        edge_attr  dst
0     0  to the right of    1
1     0  to the right of   17
2     0   to the left of    7
3     1           behind   16
4     1  to the right of   13
..  ...              ...  ...
57   17   to the left of    0
58   17  to the right of    1
59   17  to the right of    3
60   17  to the right of    2
61   18   to the left of   15

[62 rows x 3 columns]