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