Earlier quoted context omitted.
You can get rid of the cleaning staff right now. The terminals will become disgusting and people will stop using them. There is no way around this type of overhead. If you have larger numbers of people passing through, you need cleaning and maintenance. Your original point isn’t even true - in California there is constant maintenance of the road network and crews of community service workers doing their sentence clea…
Roads still have far fewer staff per mile than railways, however you measure. In turn, that makes them cheaper.
Even worse for individual car transport. You need one staff (driver) per vehicle...