[jrflowers]

Yep, you definitely want a range of bus sizes. Some areas are served perfectly well with a couple of these

https://en.wikipedia.org/wiki/Thomas_Minotour

[cameldrv]

Still other are better served with these:

https://en.wikipedia.org/wiki/Messerschmitt_KR200

[jrflowers]

https://railvelocipedes.org/ 8-)