Is this a train or a bus?
This is a bus.
    src        edge_attr  dst
0     0   to the left of   18
1     2   to the left of   17
2     2   to the left of   18
3     3   to the left of   11
4     3   to the left of    9
5     3   to the left of   16
6     3   to the left of   13
7     3   to the left of   20
8     3   to the left of   19
9     3   to the left of   21
10    3   to the left of    8
11    3   to the left of    4
12    4  to the right of   14
13    4  to the right of    3
14    5   to the left of   12
15    6               of   18
16    6   to the left of   12
17    8  to the right of    3
18    8               in    9
19    8  to the right of   17
20    9  to the right of    3
21   10   to the left of   17
22   10   to the left of   14
23   11  to the right of    3
24   12  to the right of   18
25   12  to the right of    6
26   12  to the right of    5
27   13   to the left of   20
28   13  to the right of   15
29   13  to the right of    3
30   14  to the right of   10
31   14  to the right of   17
32   14   to the left of    4
33   14   to the left of   19
34   14   to the left of   21
35   15   to the left of   13
36   16  to the right of    3
37   16  to the right of   18
38   17   to the left of    8
39   17  to the right of    2
40   17   to the left of   14
41   17  to the right of   10
42   18   to the left of   19
43   18   to the left of   16
44   18  to the right of    0
45   18   to the left of   12
46   18  to the right of    2
47   18               on    7
48   18               on    5
49   18        parked on   12
50   18   to the left of   20
51   19  to the right of    3
52   19  to the right of   14
53   19  to the right of   18
54   20  to the right of    3
55   20  to the right of   13
56   20  to the right of   18
57   21  to the right of   14
58   21  to the right of    3