What vehicle is white?
The vehicle is a train.
    src        edge_attr  dst
0     0            below    4
1     0   to the left of    7
2     0  to the right of    5
3     0   to the left of    1
4     0   to the left of   10
5     0  to the right of   12
6     0  to the right of    9
7     1  to the right of    0
8     1  to the right of    3
9     2               on    1
10    3   to the left of    1
11    4            above    0
12    5   to the left of    0
13    5  to the right of   12
14    7             near   10
15    7  to the right of    0
16    7             near   11
17    9   to the left of    0
18   10             near    7
19   10  to the right of    0
20   11             near    7
21   12   to the left of    0
22   12   to the left of    5