What vehicle is the man on?
The man is on the train.
    src        edge_attr  dst
0     3  to the right of    4
1     3  to the right of    6
2     3  to the right of   12
3     4  to the right of   13
4     4   to the left of    3
5     4   to the left of   14
6     6   to the left of    3
7     7   to the left of   10
8     9      looking out    7
9    10           beside    3
10   10  to the right of    7
11   11   to the left of   14
12   12   to the left of    3
13   13               on   12
14   13   to the left of   14
15   13   to the left of    4
16   14  to the right of   13
17   14  to the right of   11
18   14  to the right of    4