What is the large vehicle called?
The vehicle is a train.
    src        edge_attr  dst
0     0   to the left of    6
1     0   to the left of    8
2     0   to the left of    4
3     1               on   10
4     1  to the right of    4
5     1  to the right of    5
6     2   to the left of    5
7     2   to the left of    4
8     2   to the left of   11
9     4   to the left of    5
10    4  to the right of    7
11    4  to the right of    2
12    4  to the right of    6
13    4  to the right of    8
14    4  to the right of    0
15    4   to the left of    1
16    5  to the right of    6
17    5   to the left of    1
18    5  to the right of    2
19    5   to the left of   10
20    5  to the right of    4
21    6   to the left of    5
22    6  to the right of    0
23    6   to the left of   11
24    6   to the left of    4
25    7   to the left of    8
26    7   to the left of    4
27    8  to the right of    7
28    8  to the right of    0
29    8   to the left of    4
30   10  to the right of    5
31   11  to the right of    6
32   11  to the right of    2