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