Which kind of vehicle is to the right of the passengers?
The vehicle is a train.
    src        edge_attr  dst
0     1   to the left of   16
1     2      standing at   10
2     2   to the left of   15
3     2   to the left of   16
4     4  to the right of   13
..  ...              ...  ...
66   21   to the left of    8
67   21  to the right of   16
68   21  to the right of   14
69   22   to the left of   16
70   22   to the left of   15

[71 rows x 3 columns]