What is the color of the train?
The train is red.
    src        edge_attr  dst
0     0  to the right of   15
1     0  to the right of   17
2     0  to the right of   19
3     0  to the right of    6
4     0  to the right of    7
..  ...              ...  ...
61   19  to the right of    1
62   19   to the left of    0
63   19   to the left of   17
64   20   to the left of    2
65   20  to the right of   15

[66 rows x 3 columns]