There currently is one option to travel by night train from London (United Kingdom) to Penzance (United Kingdom), taking approximately 8 hours: Namely the Night Riviera Sleeper WB operated by Great Western Railway.
Great Western Railway (GWR) operates the Night Riviera, a sleeper train running six days a week between London Paddington and Penzance.
There are two options: airline-style seats at no extra charge, or cabins with a separate reservation. Cabin passengers enjoy a complimentary light breakfast on the train.
Sleeper cabins come in two types: single cabins for one person and twin cabins for two people. All cabins are comfortably equipped with a sink with tabletop and waste bin, UK plug sockets and USB points, a wardrobe, and storage space under the bottom bunk. The bottom bunk converts into a sofa for daytime relaxation. Complimentary light breakfast is delivered to your cabin.
Only cabin passengers can use the shower facilities at Paddington, Penzance and Truro.
Cats, dogs and other pets can join you on board – up to two per cabin. A cleaning fee is charged per cabin. Dogs require an appropriate lead and other pets need a rigid carrier. Pets must stay on the cabin floor, not on beds, and should not be taken into corridors or lounges.