Are there both trains and bridges in the picture?
Yes, there are both a bridge and a train.
    src        edge_attr  dst
0     0   to the left of   10
1     0   to the left of    8
2     0   to the left of    6
3     0   to the left of   12
4     2   to the left of   14
5     2   to the left of    7
6     2   to the left of    5
7     2   to the left of    3
8     3   to the left of    8
9     3  to the right of    2
10    3   to the left of    6
11    3   to the left of   14
12    4         carrying    1
13    5  to the right of    7
14    5   to the left of   14
15    5   to the left of    6
16    5  to the right of    2
17    5   to the left of    8
18    6  to the right of   13
19    6  to the right of    3
20    6  to the right of    5
21    6  to the right of    0
22    6  to the right of    7
23    7   to the left of   14
24    7   to the left of    5
25    7   to the left of    6
26    7  to the right of    2
27    7   to the left of    8
28    8  to the right of    3
29    8  to the right of    5
30    8  to the right of    7
31    8  to the right of   13
32    8  to the right of    0
33   10  to the right of    0
34   10  to the right of   14
35   11  to the right of   13
36   12  to the right of   14
37   12  to the right of    0
38   12             near   14
39   13   to the left of    8
40   13   to the left of   11
41   13   to the left of    6
42   13   to the left of   14
43   14  to the right of   13
44   14   to the left of   12
45   14  to the right of    7
46   14   to the left of   10
47   14  to the right of    5
48   14  to the right of    3
49   14  to the right of    2
50   14          next to   12