Who is driving the train?
The guys are driving the train.
    src        edge_attr  dst
0     1          driving    2
1     1  to the right of    3
2     1  to the right of   10
3     1   to the left of    8
4     1  to the right of   11
5     2   to the left of    6
6     2   to the left of   14
7     3   to the left of   11
8     3   to the left of    1
9     3   to the left of    4
10    3   to the left of   10
11    3   to the left of    5
12    4               of    1
13    4  to the right of   11
14    4  to the right of   10
15    4  to the right of    3
16    5   to the left of   13
17    5  to the right of    3
18    6  to the right of    2
19    8               of    2
20    8  to the right of    1
21    8   to the left of   14
22   10               in    2
23   10   to the left of    4
24   10   to the left of    1
25   10  to the right of    3
26   11  to the right of    3
27   11   to the left of    4
28   11   to the left of    1
29   12               on    7
30   13  to the right of    5
31   14  to the right of    2
32   14  to the right of    8