Do you see any buses below the trees?
No, there is a train below the trees.
    src        edge_attr  dst
0     0             near    4
1     0            above    4
2     0          next to    4
3     0   to the left of    4
4     1               of    4
5     2  to the right of    4
6     3           beside    4
7     3            below    4
8     4             near    0
9     4            below    0
10    4   to the left of    2
11    4            under    0
12    4          next to    0
13    4           beside    3
14    4  to the right of    0