This German brochure shows the VW 411 in taxicab outfit.
The year this brochure was created the taxicab version was available with black exterior and stunning red leatherette interior only. Other features include the "Taxi" sign on the roof, a taxameter (the device that counts up the fare), a two-way radio and a sign on the passenger side dashboard that announce the availability of the cab.
This picture courtesy of Simon Glen/Australia.