That's what we call an Omnibus.

The noun, omnibus is from France where the first were built.  Looked something like this print:

Wouldn't it be fun to ride this omnibus through the streets of Paris?

The adjective omnibus looks something like this:

The mayor's omnibus spending bill was nothing but a porkbarrel bill to get re-elected.

Is this an omnibus or just your everyday ordinary catbus?