The train is in front of what?
The train is in front of the buildings.
    src        edge_attr  dst
0     0   to the left of    5
1     0   to the left of   11
2     0  to the right of    1
3     1   to the left of    7
4     1   to the left of   11
5     1   to the left of   10
6     1   to the left of    0
7     1   to the left of    3
8     2  to the right of    7
9     3  to the right of    1
10    5  to the right of    0
11    7               in    6
12    7  to the right of    1
13    7   to the left of    8
14    7   to the left of    2
15    8  to the right of    7
16    8      in front of   11
17   10  to the right of    1
18   11           behind    8
19   11  to the right of    0
20   11  to the right of    1