What is around the train car that the bridge is beside of?
The trees are around the train car.
    src        edge_attr  dst
0     0  to the right of    6
1     0  to the right of    7
2     1   to the left of    5
3     1               of    8
4     2   to the left of    3
5     3  to the right of    4
6     3  to the right of    2
7     3  to the right of    7
8     3  to the right of   10
9     3  to the right of    6
10    4   to the left of    3
11    5  to the right of    7
12    5  to the right of    1
13    5  to the right of    8
14    5  to the right of   11
15    6           around    3
16    6   to the left of    0
17    6   to the left of    9
18    6   to the left of   12
19    6   to the left of    7
20    6   to the left of    3
21    7   to the left of    0
22    7   to the left of    5
23    7  to the right of    8
24    7   to the left of    9
25    7      in front of   11
26    7  to the right of   11
27    7  to the right of    6
28    7   to the left of    3
29    8   to the left of    5
30    8   to the left of    7
31    9           beside    3
32    9  to the right of    6
33    9  to the right of    7
34   10   to the left of   12
35   10   to the left of    3
36   11   to the left of    7
37   11   to the left of    5
38   11           behind    7
39   12  to the right of    6
40   12  to the right of   10