Are there trains in this photograph?
Yes, there is a train.
    src        edge_attr  dst
0     1  to the right of    3
1     2               on    3
2     3   to the left of    6
3     3   to the left of    1
4     3   to the left of    5
5     3   to the left of    4
6     4  to the right of    3
7     4  to the right of    5
8     5  to the right of    3
9     5   to the left of    4
10    6  to the right of    3