Städtische Straßenbahnen Wien work wagon type al no. 7020. This wagon was rebuilt from a horse tram car in 1911 as no. 3581, renumbered to 7020 in 1913 and remained in service until 1976, mostly to transport sand and gravel. The sign says "Sanding car, do not overtake at stops". Length 5.6 m, wheelbase 1.8 m, weight 3.3 t.

Wiener Straßenbahnmuseum, 2011-06-26.

tobias b köhler