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