Which color is the train?
The train is yellow.
    src        edge_attr  dst
0     0   to the left of   14
1     1   to the left of    8
2     1  to the right of   11
3     2   to the left of    5
4     2   to the left of   11
5     2   to the left of    6
6     2               on    3
7     2   to the left of   14
8     2   to the left of   13
9     3   to the left of    6
10    3   to the left of    5
11    3   to the left of   11
12    3   to the left of   13
13    3   to the left of   14
14    4   to the left of    6
15    4               in    7
16    5   to the left of    8
17    5  to the right of    2
18    5  to the right of    3
19    5  to the right of   11
20    5  to the right of   10
21    5               on   14
22    6  to the right of    3
23    6  to the right of    2
24    6  to the right of   10
25    6  to the right of    7
26    6  to the right of    4
27    7   to the left of    6
28    8  to the right of    1
29    8  to the right of   13
30    8  to the right of    9
31    8  to the right of    5
32    8  to the right of   15
33    9  to the right of   11
34    9   to the left of    8
35    9  to the right of   13
36   10   to the left of   14
37   10   to the left of    5
38   10   to the left of    6
39   11   to the left of    5
40   11   to the left of    9
41   11   to the left of    1
42   11  to the right of    3
43   11   to the left of   13
44   11   to the left of   15
45   11  to the right of    2
46   11               in   12
47   13  to the right of    2
48   13   to the left of   15
49   13   to the left of    9
50   13   to the left of    8
51   13  to the right of   11
52   13  to the right of    3
53   14  to the right of    2
54   14  to the right of    3
55   14  to the right of    0
56   14  to the right of   10
57   15  to the right of   11
58   15   to the left of    8
59   15  to the right of   13