What is the old vehicle called?
The vehicle is a locomotive.
    src        edge_attr  dst
0     0               of   15
1     0   to the left of   12
2     0  to the right of    8
3     0   to the left of   21
4     0   to the left of   18
..  ...              ...  ...
69   21   to the left of   12
70   21   to the left of   10
71   21  to the right of    7
72   21  to the right of   17
73   21  to the right of    0

[74 rows x 3 columns]