What vehicle is pulled by the train?
The vehicle is a car.
    src        edge_attr  dst
0     0        pulled by    5
1     0  to the right of    2
2     0  to the right of    1
3     1   to the left of    6
4     1   to the left of    2
5     1   to the left of    0
6     2   to the left of    0
7     2  to the right of    1
8     3          next to    5
9     3             near    5
10    5            below    6
11    5          pulling    0
12    5             near    3
13    6  to the right of    1
14    6            above    5