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