The vehicle beside the platform is what color?
The train is gray.
    src        edge_attr  dst
0     0   to the left of    7
1     1  to the right of    9
2     2  to the right of   14
3     2   to the left of   13
4     3   to the left of   11
5     3   to the left of    8
6     5   to the left of    8
7     5   to the left of   12
8     5             near   13
9     5   to the left of   11
10    5           beside    8
11    6   to the left of   10
12    6  to the right of    9
13    6  to the right of   13
14    6           beside   12
15    7  to the right of    0
16    8  to the right of    3
17    8  to the right of   13
18    8  to the right of    5
19    9   to the left of    1
20    9   to the left of    6
21    9   to the left of   15
22   10  to the right of    6
23   11  to the right of    5
24   11  to the right of    3
25   12  to the right of    5
26   13   to the left of    8
27   13   to the left of   15
28   13  to the right of    2
29   13   to the left of    6
30   13             near    5
31   13  to the right of   14
32   14   to the left of   13
33   14   to the left of    2
34   15  to the right of   13
35   15  to the right of    9