What kind of vehicle is to the right of the trailer?
The vehicle is a train.
    src        edge_attr  dst
0     0          next to   18
1     0             near   18
2     1  to the right of   19
3     1  to the right of    8
4     1   to the left of   18
5     2       sitting on   18
6     2       talking to    1
7     2  to the right of   19
8     2  to the right of   16
9     3  to the right of   21
10    3  to the right of   20
11    3  to the right of    4
12    4   to the left of    3
13    5  to the right of    6
14    5  to the right of   11
15    6  to the right of   19
16    6  to the right of   11
17    6   to the left of    5
18    6   to the left of   10
19    6   to the left of    7
20    7  to the right of    6
21    7  to the right of   11
22    8   to the left of    1
23    8   to the left of   18
24   10  to the right of    6
25   11   to the left of    5
26   11   to the left of    7
27   11   to the left of    6
28   13  to the right of   16
29   14  to the right of   17
30   15  to the right of   19
31   15  to the right of   16
32   16   to the left of   18
33   16   to the left of    2
34   16   to the left of   15
35   16   to the left of   13
36   16        parked on    8
37   17   to the left of   14
38   18  to the right of   19
39   18             near    0
40   18  to the right of   16
41   18  to the right of    1
42   18  to the right of    8
43   19   to the left of    2
44   19   to the left of    1
45   19   to the left of   15
46   19   to the left of    6
47   19   to the left of   18
48   20  to the right of   21
49   20  to the right of   22
50   20   to the left of    3
51   21   to the left of    3
52   21   to the left of   20
53   21  to the right of   22
54   22   to the left of   21
55   22   to the left of   20