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