Do you see a lamp to the right of the train the steam is coming out of?
Yes, there are lamps to the right of the train.
    src        edge_attr  dst
0     0    coming out of    1
1     0  to the right of   10
2     0   to the left of    9
3     0   to the left of   19
4     1   to the left of   19
..  ...              ...  ...
81   21  to the right of   17
82   21  to the right of   18
83   21   to the left of    7
84   21  to the right of    8
85   21  to the right of    2

[86 rows x 3 columns]