What vehicle is behind him?
The vehicle is a train.
    src        edge_attr  dst
0     0  to the right of   13
1     0  to the right of    9
2     1  to the right of   13
3     1  to the right of    9
4     1               on   11
5     1  to the right of    3
6     1  to the right of    2
7     2   to the left of    3
8     2   to the left of    1
9     2             near    9
10    2  to the right of    4
11    2          next to    9
12    3   to the left of    7
13    3  to the right of    2
14    3   to the left of    1
15    4   to the left of    9
16    4   to the left of    2
17    4   to the left of   13
18    4            below   10
19    5  to the right of   14
20    5  to the right of   12
21    7  to the right of   13
22    7               in    1
23    7  to the right of    3
24    7  to the right of    9
25    8   to the left of    9
26    8   to the left of   13
27    9       sitting on   11
28    9               on   11
29    9      in front of   10
30    9             near    2
31    9   to the left of    0
32    9   to the left of    1
33    9  to the right of    4
34    9   to the left of    7
35    9  to the right of    8
36   10           behind    9
37   10             near   11
38   10           behind   11
39   11             near   10
40   11      in front of   10
41   11               on    6
42   12   to the left of    5
43   13  to the right of    8
44   13   to the left of    0
45   13  to the right of    4
46   13   to the left of    1
47   13   to the left of    7
48   14   to the left of    5