What is on the platform?
The bike is on the platform.
   src        edge_attr  dst
0    2   to the left of    4
1    2               of    3
2    3               on    0
3    4  to the right of    2
4    5               on    1
5    6               on    1
6    7               on    1
7    8               on    3
8    9               on    1