What color is the train in the middle?
The train is yellow.
    src        edge_attr  dst
0     0               of   10
1     0   to the left of    7
2     1  to the right of    3
3     1  to the right of    2
4     2   to the left of   10
5     2   to the left of    7
6     2   to the left of    5
7     2   to the left of    1
8     3   to the left of    1
9     3  to the right of    4
10    3   to the left of    5
11    3  to the right of    8
12    4  to the right of    6
13    4   to the left of    3
14    4   to the left of    8
15    4               of    2
16    4   to the left of   10
17    5  to the right of    8
18    5  to the right of    2
19    5  to the right of    3
20    6   to the left of    8
21    6   to the left of    4
22    7  to the right of    0
23    7  to the right of   10
24    7  to the right of    9
25    7  to the right of    2
26    8   on the side of    2
27    8  to the right of    4
28    8   to the left of    5
29    8  to the right of    6
30    8   to the left of    3
31    9   to the left of    7
32   10   to the left of    7
33   10  to the right of    2
34   10  to the right of    4