What's on the platform?
The clock is on the platform.
    src        edge_attr  dst
0     0   to the left of   11
1     0  to the right of    4
2     0  to the right of    9
3     0  to the right of    7
4     1   to the left of   10
5     3  to the right of    5
6     4   to the left of    0
7     4   to the left of   10
8     5   to the left of    3
9     6   to the left of   10
10    7   to the left of   10
11    7   to the left of    0
12    7               on   10
13    8            below    9
14    9               on    8
15    9   to the left of    0
16    9            above    8
17    9   to the left of   10
18   10  to the right of    4
19   10  to the right of    9
20   10  to the right of    7
21   10  to the right of    6
22   10  to the right of    1
23   10   to the left of   11
24   11  to the right of   10
25   11  to the right of    0