Who is boarding the parked train on the platform?
The people are boarding the train.
    src        edge_attr  dst
0     0  to the right of    9
1     0   to the left of    1
2     1  to the right of   13
3     1  to the right of    2
4     1  to the right of    0
5     1  to the right of    5
6     1   to the left of   11
7     2               of   13
8     2   to the left of    1
9     2  to the right of    9
10    2   to the left of   11
11    4   to the left of    9
12    4               of   13
13    5   to the left of    1
14    5               of   12
15    7               on    1
16    7  to the right of   13
17    7   to the left of   14
18    8   to the left of   14
19    8  to the right of   13
20    8   to the left of   11
21    9   to the left of    0
22    9  to the right of    4
23    9   to the left of    2
24   10  to the right of   13
25   11             near   13
26   11  to the right of   13
27   11  to the right of    1
28   11  to the right of    8
29   11  to the right of    2
30   11   to the left of   14
31   11         boarding   13
32   11               on   10
33   11      standing on   10
34   12             near   13
35   12        parked by    6
36   13             near   11
37   13             near   12
38   13               on   10
39   13   to the left of   10
40   13   to the left of    8
41   13   to the left of   14
42   13   to the left of   11
43   13   to the left of    1
44   13   to the left of    7
45   14  to the right of    7
46   14  to the right of   13
47   14  to the right of   11
48   14  to the right of    8