What is the picture showing?
It is showing a railroad.
    src        edge_attr  dst
0     0               in    8
1     0   to the left of   22
2     1   to the left of   12
3     1   to the left of   14
4     1   to the left of   19
5     2  to the right of    3
6     3  to the right of   22
7     3   to the left of    2
8     3    coming out of    7
9     3      coming from   13
10    5   to the left of   15
11    5   to the left of   21
12    6   to the left of   12
13    6  to the right of   23
14    9           beside    5
15   10           beside   12
16   12  to the right of    1
17   12  to the right of    6
18   12  to the right of   20
19   12  to the right of   23
20   14  to the right of    1
21   14  to the right of   23
22   15  to the right of   18
23   15  to the right of    5
24   15  to the right of   19
25   18   to the left of   15
26   18   to the left of   21
27   19               on   18
28   19   to the left of   15
29   19  to the right of    1
30   19   to the left of   21
31   20   to the left of   12
32   21  to the right of   19
33   21               on   20
34   21  to the right of    5
35   21  to the right of   18
36   22               in    2
37   22  to the right of    0
38   22   to the left of    3
39   23   to the left of   12
40   23   to the left of   14
41   23   to the left of    6