What vehicle is below the power line?
The vehicle is a train.
    src        edge_attr  dst
0     0  to the right of    6
1     0               in    1
2     2               in    1
3     2  to the right of    6
4     3               in    1
5     4   to the left of    5
6     5  to the right of   11
7     5            below    6
8     5  to the right of    8
9     5  to the right of    4
10    6            above    5
11    6   to the left of    0
12    6  to the right of    7
13    6   to the left of    2
14    7   to the left of    6
15    7   to the left of    9
16    7               in    1
17    8   to the left of    5
18    9  to the right of    7
19    9               in    1
20   11   to the left of    5