Which kind of vehicle is right of the cars?
The vehicle is a locomotive.
    src        edge_attr  dst
0     0   to the left of    1
1     0  to the right of    9
2     0  to the right of    8
3     1  to the right of    6
4     1   to the left of   10
5     1  to the right of    0
6     2   to the left of   10
7     2  to the right of    9
8     2  to the right of    8
9     3   to the left of   12
10    5   to the left of   12
11    6   to the left of    1
12    8   to the left of    0
13    8   to the left of    2
14    8               on    9
15    9   to the left of    0
16    9   to the left of    2
17    9           beside    2
18   10  to the right of    1
19   10  to the right of    2
20   12  to the right of    3
21   12  to the right of    5