What is coming from the train in the center?
The smoke is coming from the train.
    src        edge_attr  dst
0     0               on    7
1     0   to the left of    5
2     1  to the right of    9
3     1   to the left of   10
4     1   to the left of    3
5     1  to the right of    7
6     2      coming from   11
7     3  to the right of    1
8     3  to the right of   11
9     4   to the left of   11
10    4   to the left of    9
11    5  to the right of    0
12    6   to the left of   10
13    7   to the left of    1
14    8     hanging over    3
15    9   to the left of   11
16    9  to the right of    4
17    9   to the left of    1
18   10  to the right of    6
19   10  to the right of   11
20   10  to the right of    1
21   11  to the right of    4
22   11   to the left of    3
23   11  to the right of    9
24   11   to the left of   10