Is there a train or a bus that is not red?
No, there is a train but it is red.
    src        edge_attr  dst
0     0   to the left of    2
1     0  to the right of   10
2     1   to the left of    6
3     1   to the left of    9
4     2  to the right of    0
5     2  to the right of   10
6     3   to the left of    9
7     4               on    5
8     6  to the right of    1
9     9  to the right of    3
10    9  to the right of    1
11   10   to the left of    2
12   10   to the left of    0