Are there blue trains or trucks?
Yes, there is a blue truck.
     src        edge_attr  dst
0      0  to the right of   21
1      0  to the right of   20
2      0   on the back of   20
3      0  to the right of   22
4      0  to the right of   18
..   ...              ...  ...
161   27  to the right of   13
162   27  to the right of   14
163   27  to the right of    4
164   27  to the right of    2
165   27  to the right of   26

[166 rows x 3 columns]