postbus

/ ˈpəʊstˌbʌs /

noun

1. (in Britain, esp in rural districts) a vehicle carrying the mail that also carries passengers

Example Sentences

There's also Postbus, a bus service connecting rural areas to urban centres, which offers hundreds of journeys via several apps or you can purchase tickets from stations and drivers.

From BBC

From there, I took the Postbus to Stechelberg, where Swiss Skyline’s cableway carried me up to Murren.

From Washington Times