What kind of vehicle is this?
This is a locomotive.
    src        edge_attr  dst
0     0  to the right of    9
1     0               on    4
2     0  to the right of    6
3     0  to the right of    7
4     3  to the right of    9
5     5               on    0
6     5  to the right of    9
7     5  to the right of    7
8     6   to the left of    0
9     7   to the left of    0
10    7   to the left of    5
11    9   to the left of    5
12    9   to the left of    0
13    9   to the left of    3
14    9               by    0