Are there either any trains or fences in this photograph?
Yes, there is a train.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of    1
2     1  to the right of    0
3     2  to the right of    0
4     3  to the right of    5
5     3   to the left of    4
6     3  to the right of    8
7     3  to the right of    7
8     4  to the right of    6
9     4  to the right of    3
10    5   to the left of    3
11    6   to the left of    4
12    6  to the right of    9
13    7   to the left of    3
14    8   to the left of    3
15    9   to the left of    6