While not a subway, the Sonnenland Draisentour is reminiscient of Hootervile, USA and deserves honorable mention simply because of it's unusual nature. There's nothing quite like biking over 23 km of rail track when Ingrid sweats under the gentle Austrian sun.
4 subways, including the Serfaus Dorfbahn, the smallest subway in the world,
a light rail line line in Salzburg with one subway station, a new
underground tramway in Graz, and a major
rapid transit system in Vienna.
a Bim - Tramway Sonderfahrten, rent a tram in Vienna
Kempel's Austrian Streetcar and U-Bahn pages
Trams In Austria
gauge photos from the European Railway Server
Railway and Streetcar Pages (includes tram and metro images)
is a private Austrian railroad that uses trams, EMUs, and locomotives
Austria by Rail
Austrian tramways from Transport of Delight