Who is in front of the train?
The driver is in front of the train.
    src        edge_attr  dst
0     0           inside    9
1     0           behind    4
2     0             near    7
3     0  to the right of   10
4     0  to the right of   12
5     1   to the left of    3
6     1   on the side of    0
7     1  to the right of    5
8     1  to the right of    4
9     1  to the right of   11
10    2   on the side of    0
11    3  to the right of    6
12    3  to the right of    5
13    3  to the right of   11
14    3  to the right of    4
15    3  to the right of    1
16    4   to the left of    1
17    4   to the left of    3
18    4      in front of    0
19    5   to the left of    3
20    5   to the left of    1
21    5  on the front of    0
22    6   to the left of    3
23    7             near    0
24    7          next to    0
25    7             near   12
26   10   to the left of    0
27   11   to the left of    3
28   11   to the left of    1
29   12          next to    7
30   12   to the left of    0