Which kind of vehicle is brown?
The vehicle is a train.
    src        edge_attr  dst
0     0   to the left of    9
1     0  to the right of    8
2     1          full of    3
3     1   to the left of    2
4     1   to the left of    5
5     1   to the left of    4
6     2  to the right of    1
7     2   to the left of    5
8     2  to the right of    3
9     3   to the left of    2
10    4  to the right of    1
11    4   to the left of    5
12    5  to the right of    1
13    5  to the right of    2
14    5  to the right of    4
15    5           behind    7
16    6   to the left of    7
17    7               of    6
18    7  to the right of    6
19    7      in front of    5
20    8   to the left of    9
21    8   to the left of    0
22    9  to the right of    8
23    9  to the right of    0