What is the color of the train on the railroad?
The train is white.
    src        edge_attr  dst
0     0   to the left of    2
1     0  to the right of    7
2     0  to the right of    3
3     2  to the right of    9
4     2  to the right of    0
5     3   to the left of    0
6     3   to the left of    9
7     3   to the left of   11
8     3           behind    7
9     3   to the left of    7
10    6   to the left of   10
11    7   to the left of   11
12    7      in front of    3
13    7   to the left of    0
14    7  to the right of    3
15    9  to the right of    3
16    9               on   11
17    9   to the left of    2
18    9   to the left of   10
19    9   to the left of   12
20   10  to the right of    9
21   10  to the right of    6
22   11  to the right of    3
23   11  to the right of    7
24   12  to the right of    9