Is the train green or black?
The train is black.
    src        edge_attr  dst
0     0  to the right of    1
1     0  to the right of   17
2     1   to the left of   17
3     1   to the left of    0
4     1  to the right of    8
..  ...              ...  ...
60   17  to the right of    7
61   17  to the right of    1
62   17   to the left of    0
63   17  to the right of    5
64   17  to the right of    8

[65 rows x 3 columns]