The female passenger was wearing nothing but a pair of leather boots and travelled several stops before getting off.
Vienna U-Bahn staff are now studying CCTV footage to determine the identity of the naked lady.
Witnesses said she didn't seem fazed by her lack of clothing, despite the fact that many parts of Austria are experiencing snowfall and temperatures are close to freezing.
Vienna U-Bahn staff are now studying CCTV footage to determine the identity of the naked lady.
Witnesses said she didn't seem fazed by her lack of clothing, despite the fact that many parts of Austria are experiencing snowfall and temperatures are close to freezing.