What's the carriage made of?
The carriage is made of metal.
     src        edge_attr  dst
0      0   to the left of    6
1      0  to the right of   13
2      0  to the right of   22
3      0   to the left of    2
4      0   to the left of    8
..   ...              ...  ...
109   22  to the right of   19
110   22   to the left of   12
111   23   to the left of   18
112   23               of    3
113   23  to the right of   11

[114 rows x 3 columns]