Are there any trains on the dirt?
Yes, there is a train on the dirt.
    src        edge_attr  dst
0     0  to the right of   12
1     0   to the left of    1
2     0   to the left of   17
3     0  to the right of   14
4     1   to the left of    7
5     1  to the right of    0
6     1  to the right of   14
7     1  to the right of   12
8     1   to the left of   17
9     2   to the left of   12
10    2   to the left of   20
11    3               in    5
12    3  to the right of   13
13    3  to the right of    6
14    6   to the left of    3
15    7  to the right of   20
16    7  to the right of    1
17    9               on    8
18   12   to the left of   14
19   12   to the left of    1
20   12   to the left of    0
21   12  to the right of    2
22   12  to the right of   19
23   13   to the left of    3
24   14   to the left of    0
25   14   to the left of    1
26   14  to the right of   12
27   17  to the right of    0
28   17  to the right of    1
29   17  to the right of   20
30   19               on   16
31   19   to the left of   12
32   19   to the left of   20
33   20   to the left of   17
34   20  to the right of    2
35   20  to the right of   19
36   20               on   16
37   20   to the left of    7