What is the name of the vehicle that the trees are behind of?
The vehicle is a train car.
    src        edge_attr  dst
0     0   to the left of    3
1     0   to the left of    1
2     1   to the left of    3
3     1  to the right of    0
4     2           behind    5
5     2   to the left of    3
6     3  to the right of    1
7     3  to the right of    0
8     3  to the right of    2
9     4           behind    5
10    5      in front of   10
11    5      in front of    2
12    5      in front of    6
13    5      in front of   11
14    5          next to    8
15    5      in front of    9
16    5      in front of    4
17    5             near    8
18    6   to the left of   10
19    6  to the right of    9
20    6           behind    5
21    7  to the right of    9
22    8             near    5
23    9   to the left of    7
24    9   to the left of    6
25    9           behind    5
26   10           behind    5
27   10  to the right of    6
28   11           behind    5