What is the color of this train?
The train is white.
    src        edge_attr  dst
0     0               in    1
1     7   to the left of   21
2     9  to the right of   12
3     9  to the right of   17
4    12  to the right of   19
5    12   to the left of    9
6    12  to the right of   20
7    12  to the right of   15
8    12   to the left of   16
9    14   to the left of   15
10   14  to the right of   18
11   14   to the left of   19
12   14   to the left of   21
13   15               of   14
14   15  to the right of   14
15   15   to the left of   12
16   16  to the right of   19
17   16  to the right of   20
18   16  to the right of   12
19   17  to the right of   20
20   17   to the left of    9
21   17  to the right of   19
22   18   to the left of   14
23   18   to the left of   20
24   18   to the left of   19
25   19   to the left of   12
26   19  to the right of   14
27   19   to the left of   17
28   19   to the left of   16
29   19  to the right of   18
30   20  to the right of   18
31   20   to the left of   16
32   20   to the left of   17
33   20   to the left of   12
34   21  to the right of   14
35   21  to the right of    7