Which kind of vehicle is red?
The vehicle is a locomotive.
    src        edge_attr  dst
0     0   to the left of    5
1     0   to the left of   11
2     0   to the left of    6
3     1  to the right of    8
4     1  to the right of    6
5     1  to the right of    3
6     1  to the right of   11
7     2   to the left of    6
8     2   to the left of   11
9     3  to the right of    4
10    3  to the right of    5
11    3   to the left of    7
12    3   to the left of    1
13    4   to the left of    3
14    5  to the right of    0
15    5   to the left of    3
16    5   to the left of    6
17    6   to the left of    1
18    6  to the right of    2
19    6  to the right of    0
20    6  to the right of    5
21    6   to the left of    8
22    7  to the right of    3
23    7  to the right of   11
24    8  to the right of    6
25    8   to the left of    1
26   11  to the right of    0
27   11  to the right of    2
28   11   to the left of    1
29   11   to the left of    7