What color is the tunnel the train is leaving?
The tunnel is gray.
    src        edge_attr  dst
0     0               of   14
1     0           beside    5
2     1  to the right of    8
3     1  to the right of   11
4     1  to the right of    7
..  ...              ...  ...
61   16   to the left of    4
62   17  to the right of    7
63   17  to the right of    4
64   17  to the right of   14
65   17  to the right of    1

[66 rows x 3 columns]