What is under the metal bridge?
The train is under the bridge.
    src        edge_attr  dst
0     0  to the right of    3
1     1            above    8
2     2   to the left of    4
3     2   to the left of   10
4     2  to the right of    6
5     3   to the left of    0
6     3   to the left of   11
7     4  to the right of    2
8     4  to the right of    5
9     4  to the right of    9
10    5   to the left of   10
11    5   to the left of    4
12    5  to the right of    6
13    6   to the left of    2
14    6  to the right of   13
15    6   to the left of    5
16    6   to the left of   10
17    8            under    1
18    8   to the left of   12
19    8  to the right of   13
20    8               on    7
21    9  to the right of   13
22    9   to the left of   10
23    9   to the left of   12
24    9   to the left of    4
25    9               of    8
26   10  to the right of    9
27   10  to the right of    5
28   10   to the left of   12
29   10               of    8
30   10  to the right of    2
31   10  to the right of    6
32   11  to the right of    3
33   12  to the right of    9
34   12  to the right of    8
35   12  to the right of   10
36   13   to the left of    8
37   13   to the left of    6
38   13   to the left of    9