Which kind of vehicle is this?
This is a locomotive.
    src        edge_attr  dst
0     0  to the right of   12
1     0  to the right of   14
2     0   to the left of    4
3     0   to the left of   20
4     1   to the left of   14
..  ...              ...  ...
80   20  to the right of    0
81   20  to the right of   12
82   20  to the right of    8
83   20  to the right of   14
84   20      standing at    4

[85 rows x 3 columns]