How is the device on the platform called?
The device is a speaker.
    src        edge_attr  dst
0     0   to the left of    1
1     1  to the right of    0
2     1  to the right of    9
3     3   to the left of   10
4     3   to the left of   16
..  ...              ...  ...
69   20   to the left of   16
70   20   to the left of    3
71   20   to the left of   13
72   20   to the left of   10
73   20   to the left of    6

[74 rows x 3 columns]