What vehicle in the photograph is blue?
The vehicle is a train.
     src        edge_attr  dst
0      0   to the left of   17
1      1  to the right of   21
2      1  to the right of   18
3      3   to the left of    7
4      3  to the right of    6
..   ...              ...  ...
97    21   to the left of    1
98    21   to the left of    4
99    21   to the left of    5
100   21   to the left of   12
101   21   to the left of   19

[102 rows x 3 columns]