Do you see any trains or cars?
Yes, there is a train.
     src        edge_attr  dst
0      0   to the left of    3
1      0  to the right of    1
2      0   to the left of   23
3      0  to the right of   21
4      1   to the left of    3
..   ...              ...  ...
120   25   to the left of   10
121   25   to the left of    4
122   25   to the left of    5
123   25   to the left of    8
124   25  to the right of    2

[125 rows x 3 columns]