On which side is the train car?
The train car is on the left of the image.
    src        edge_attr  dst
0     0   to the left of    1
1     0  to the right of    4
2     1  to the right of    4
3     1  to the right of    0
4     2               in    7
5     2   to the left of    3
6     3  to the right of    2
7     4   to the left of    1
8     4   to the left of    0
9     5   to the left of    6
10    5         crossing    1
11    6  to the right of    5