Do you see either any trains or buses that are yellow?
Yes, the bus is yellow.
     src        edge_attr  dst
0      0  to the right of   20
1      0  to the right of    7
2      1  to the right of   22
3      2   to the left of    7
4      3  to the right of   19
..   ...              ...  ...
118   22   to the left of    6
119   22  to the right of    3
120   22  to the right of    7
121   22   to the left of    1
122   22  to the right of   20

[123 rows x 3 columns]