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