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