What type of vehicle is the same color as the sign?
The train is the same color as the sign.
    src        edge_attr  dst
0     0  to the right of    7
1     1               of    2
2     1   to the left of   11
3     3               of    2
4     3  to the right of    9
5     4  to the right of    9
6     7   to the left of    8
7     7   to the left of    0
8     7               of    2
9     8               of    2
10    8  to the right of    7
11    9   to the left of    4
12    9   to the left of    3
13   11  to the right of    1