What is the color of the train in the station?
The train is silver.
    src        edge_attr  dst
0     0  to the right of    8
1     0  to the right of    4
2     1   to the left of    6
3     1               in    5
4     2  to the right of    7
5     3   to the left of    8
6     3   to the left of    4
7     4  to the right of    3
8     4   to the left of    0
9     4   to the left of    8
10    6  to the right of    1
11    7   to the left of    2
12    8  to the right of    4
13    8  to the right of    3
14    8   to the left of    0