Is there a train to the right of the box that is shown in this image?
Yes, there is a train to the right of the box.
   src        edge_attr  dst
0    0   to the left of    3
1    1  to the right of    3
2    3   to the left of    1
3    3  to the right of    6
4    3  to the right of    0
5    4               of    3
6    5               of    3
7    6   to the left of    3