Does the train have a different color than the door?
Yes, the door is yellow and the train is blue.
    src        edge_attr  dst
0     0  to the right of    6
1     1   to the left of    4
2     1             near    2
3     2          next to    1
4     2   to the left of    4
5     2             near    1
6     4       looking at    3
7     4  to the right of    1
8     4  to the right of    2
9     5  to the right of    6
10    6   to the left of    5
11    6   to the left of    0