What color is the old train?
The train is black.
    src        edge_attr  dst
0     0   to the left of   21
1     0   to the left of   24
2     0   to the left of   23
3     2   to the left of    8
4     2   to the left of   20
..  ...              ...  ...
58   23  to the right of   15
59   23  to the right of    0
60   24  to the right of   22
61   24  to the right of   15
62   24  to the right of    0

[63 rows x 3 columns]