Are there either any trains or buses that are not small?
No, there is a bus but it is small.
     src        edge_attr  dst
0      0  to the right of   10
1      2   to the left of    3
2      2   to the left of    8
3      2   to the left of    7
4      2   to the left of   10
..   ...              ...  ...
140   23  to the right of    8
141   23  to the right of   10
142   23  to the right of   14
143   23   to the left of   21
144   23   to the left of   13

[145 rows x 3 columns]