What is the vehicle on the street?
The vehicle is a train.
    src        edge_attr  dst
0     0   to the left of    4
1     0  to the right of    3
2     0   to the left of   10
3     1               on   13
4     1  to the right of    5
5     2   to the left of    4
6     2               on    3
7     3   to the left of    0
8     3   to the left of    6
9     3   to the left of    4
10    4  to the right of    0
11    4             near   12
12    4               on   10
13    4             near   11
14    4   to the left of   11
15    4  to the right of    6
16    4  to the right of    3
17    4  to the right of    2
18    4   to the left of   13
19    4  to the right of   12
20    4               in   10
21    5   to the left of   13
22    5   to the left of    1
23    6  to the right of    3
24    6   to the left of    4
25    7               in   14
26    7  to the right of    8
27    7  to the right of   11
28    7  to the right of   15
29    8  to the right of   15
30    8   to the left of    7
31    8  to the right of   11
32    8   to the left of    9
33    9           behind   13
34    9  to the right of    8
35   10  to the right of    0
36   10             near   13
37   11  to the right of    4
38   11   to the left of    7
39   11               on   10
40   11             near    4
41   11   to the left of   14
42   11   to the left of    8
43   12             near    4
44   12   to the left of    4
45   12          next to    4
46   13  to the right of    4
47   13          next to   10
48   13      in front of    9
49   13               in   14
50   13  to the right of    5
51   14  to the right of   15
52   14  to the right of   11
53   15   to the left of   14
54   15   to the left of    8
55   15   to the left of    7