What is the vehicle that the logs are in?
The vehicle is a train.
    src        edge_attr  dst
0     0   to the left of    5
1     0   to the left of   13
2     0   to the left of   17
3     0  on the front of    3
4     1  to the right of    4
5     1  on the front of    3
6     1   to the left of   11
7     2   to the left of    5
8     2  to the right of    8
9     3  to the right of   12
10    3  to the right of    8
11    3   to the left of   11
12    3  to the right of    9
13    3   to the left of   15
14    3  to the right of    6
15    4  to the right of    9
16    4   to the left of    5
17    4  to the right of    8
18    4   to the left of    1
19    4  to the right of   12
20    4   to the left of   10
21    4   to the left of   14
22    5    coming out of    3
23    5  to the right of    7
24    5  to the right of    2
25    5  to the right of    4
26    5  to the right of    0
27    6  to the right of   12
28    6   to the left of    3
29    6               in    3
30    7   to the left of    5
31    7   to the left of   13
32    7   to the left of   17
33    8   to the left of    4
34    8   to the left of   16
35    8   to the left of    2
36    8   to the left of    3
37    9   to the left of    4
38    9   to the left of    3
39   10   to the left of   11
40   10  to the right of    4
41   10  on the front of    3
42   11  to the right of    1
43   11  to the right of   10
44   11  to the right of    3
45   11  to the right of   14
46   12   to the left of    4
47   12   to the left of    6
48   12   to the left of    3
49   13  to the right of    7
50   13  to the right of    0
51   13   to the left of   17
52   14   to the left of   11
53   14  on the front of    3
54   14  to the right of    4
55   15  to the right of    3
56   16  to the right of    8
57   17  to the right of    7
58   17  to the right of   13
59   17  to the right of    0