Are there any trains or trucks that are not black?
No, there is a truck but it is black.
    src        edge_attr  dst
0     0   to the left of   11
1     0   to the left of   12
2     0   to the left of    8
3     0   to the left of    7
4     0   to the left of    3
5     1   to the left of   12
6     2  to the right of    6
7     3  to the right of   11
8     3  to the right of    6
9     3  to the right of    0
10    4   to the left of    5
11    5  to the right of    4
12    5   to the left of    8
13    5   to the left of    7
14    6   to the left of   14
15    6   to the left of   12
16    6   to the left of    9
17    6   to the left of    3
18    6   to the left of   10
19    6   to the left of    2
20    6   to the left of   13
21    7  to the right of    5
22    7  to the right of    0
23    7   to the left of    9
24    8  to the right of    0
25    8  to the right of    5
26    8   to the left of    9
27    9  to the right of    6
28    9  to the right of    8
29    9  to the right of    7
30   10  to the right of    6
31   11  to the right of    0
32   11   to the left of    3
33   12  to the right of    0
34   12  to the right of    6
35   12  to the right of    1
36   13               on   10
37   13  to the right of    6
38   14  to the right of    6