Is this a train or a truck?
This is a train.
     src        edge_attr  dst
0      0  to the right of   25
1      0  to the right of   27
2      0   to the left of   28
3      0  to the right of   26
4      0   to the left of    2
..   ...              ...  ...
193   30   to the left of   16
194   30   to the left of   15
195   30   to the left of    5
196   30   to the left of   26
197   30   to the left of   12

[198 rows x 3 columns]