Are there any yellow trains or cars?
Yes, there is a yellow train.
     src        edge_attr  dst
0      0   to the left of   16
1      0   to the left of    7
2      1   to the left of   16
3      1   to the left of    7
4      2   to the left of   16
..   ...              ...  ...
135   36               on   22
136   37   to the left of   21
137   37  to the right of   12
138   37   to the left of   30
139   37  to the right of   17

[140 rows x 3 columns]