On which side of the picture is the train engine?
The train engine is on the right of the image.
     src        edge_attr  dst
0      0  to the right of    8
1      0  to the right of    7
2      0   to the left of   21
3      1  to the right of    7
4      1  to the right of    6
..   ...              ...  ...
152   24   to the left of   12
153   24   to the left of    6
154   24   to the left of   13
155   24   to the left of   17
156   24   to the left of   15

[157 rows x 3 columns]