What vehicle is massive?
The vehicle is a train.
    src        edge_attr  dst
0     0             near    3
1     0            below    1
2     0             near    2
3     0  to the right of    6
4     0  to the right of    3
5     0  to the right of    5
6     0  to the right of    4
7     2  to the right of    3
8     2  to the right of    5
9     2             near    0
10    3               by    0
11    3   to the left of    0
12    3   to the left of    4
13    3   to the left of    2
14    3             near    0
15    4  to the right of    3
16    4   to the left of    0
17    4  to the right of    5
18    5   to the left of    4
19    5   to the left of    2
20    5   to the left of    0
21    5               by    6
22    6   to the left of    0