Do you see either a red train or bus?
Yes, there is a red bus.
     src        edge_attr  dst
0      0  to the right of   13
1      0  to the right of   12
2      0  to the right of   31
3      0  to the right of   30
4      0  to the right of    4
..   ...              ...  ...
130   30   to the left of    0
131   31   to the left of    0
132   31   to the left of   30
133   31  to the right of   12
134   31  to the right of   13

[135 rows x 3 columns]