What is the vehicle behind the fence?
The vehicle is a train.
    src        edge_attr  dst
0     0  to the right of   10
1     0  to the right of   12
2     1  to the right of    5
3     1  to the right of    4
4     2           behind    3
5     3   to the left of   11
6     3   to the left of    4
7     3      in front of    2
8     4             with    5
9     4  to the right of    3
10    4   to the left of    1
11    4  to the right of   13
12    4   to the left of   11
13    5   to the left of    1
14    6   to the left of   12
15    6   to the left of   13
16    6          holding    9
17    6   to the left of    7
18    6   to the left of   10
19    6   to the left of    8
20    7   to the left of   13
21    7  to the right of    6
22    8  to the right of    6
23    8  to the right of    9
24    9   to the left of    8
25   10   to the left of   13
26   10   to the left of    0
27   10  to the right of    6
28   10   to the left of   12
29   11  to the right of    3
30   11  to the right of    4
31   12   to the left of   13
32   12  to the right of   10
33   12  to the right of    6
34   12   to the left of    0
35   13  to the right of    7
36   13   to the left of    4
37   13  to the right of   12
38   13  to the right of    6
39   13  to the right of   10