Are the train and the fence the same color?
Yes, both the train and the fence are black.
    src        edge_attr  dst
0     0  to the right of   13
1     0  to the right of   10
2     1               in    4
3     1   to the left of    5
4     2   to the left of    6
5     3  to the right of   10
6     3  to the right of   11
7     3  to the right of    7
8     3  to the right of   13
9     3               in    4
10    3  to the right of    5
11    4  to the right of   12
12    5   to the left of    3
13    5  to the right of    1
14    6  to the right of    2
15    7   to the left of    3
16    8  to the right of   13
17   10   to the left of    3
18   10   to the left of    0
19   11   to the left of    3
20   12   to the left of    4
21   13   to the left of    0
22   13   to the left of    3
23   13   to the left of    8