Book a Reliable Slough Taxi in minutes online Viking Cars 511 is a well established and experienced private hire taxi company, based in Slough with around 45 years experience. viking Cars 511 cater for business, corporate, residential clients, delivery service and more according to client’s demand. We use an up-to the standard software system to tackle all your bookings and tracking. With so many services we are Slough’s most reliable taxi company. You can visit our Google reviews page to see what people say about Viking Cars 511.