What color is the train to the left of the other train?
The train is red.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of   15
2     0   to the left of   10
3     0   to the left of    5
4     0   to the left of    6
..  ...              ...  ...
63   15  to the right of    7
64   15   to the left of    8
65   15  to the right of    0
66   15  to the right of    1
67   16   to the left of    9

[68 rows x 3 columns]