What is in front of the bridge?
The train is in front of the bridge.
     src        edge_attr  dst
0      0   to the left of    4
1      0      coming from   19
2      0  to the right of   16
3      0  to the right of   15
4      0  to the right of    7
..   ...              ...  ...
117   22  to the right of    6
118   22  to the right of    7
119   22             near   13
120   22             near   14
121   22             near   18

[122 rows x 3 columns]