Is there either a blue train or bus?
No, there is a bus but it is white.
    src        edge_attr  dst
0     0   to the left of   13
1     0   to the left of    1
2     0   to the left of   20
3     0  to the right of   18
4     1  to the right of    0
5     1  to the right of   20
6     1  to the right of    2
7     2   to the left of   20
8     2   to the left of   15
9     2   to the left of    1
10    2   to the left of   10
11    2   to the left of   13
12    3  to the right of   15
13    4  to the right of   17
14    4               on   14
15    5  to the right of   18
16    6  to the right of    7
17    6  to the right of   18
18    7   to the left of    6
19    7  to the right of   18
20    8  to the right of   18
21    9  to the right of   18
22   10  to the right of    2
23   10   to the left of   16
24   10   to the left of   15
25   10  to the right of   12
26   12   to the left of   15
27   12   to the left of   10
28   13  to the right of   18
29   13   to the left of   19
30   13  to the right of    0
31   13   to the left of   16
32   13  to the right of    2
33   14  to the right of   17
34   15  to the right of   10
35   15  to the right of   12
36   15   to the left of   16
37   15  to the right of    2
38   15   to the left of    3
39   16          holding    3
40   16  to the right of   10
41   16  to the right of   15
42   16  to the right of   13
43   17   to the left of   14
44   17   to the left of    4
45   18   to the left of    6
46   18   to the left of   20
47   18   to the left of    9
48   18   to the left of    8
49   18               of    2
50   18   to the left of    5
51   18   to the left of    0
52   18   to the left of   13
53   18   to the left of    7
54   19  to the right of   13
55   20   to the left of    1
56   20  to the right of    2
57   20  to the right of   18
58   20  to the right of    0