The independent Forchbahn (FB) railway uses VBZ trackwork to reach the centre of Zürich from the eastern edge of the city. The FB trains operate largely in the street for this section of their route, sharing track with VBZ tram routes, but are categorised as part of the city's S-Bahn railway network rather than as part of the tram network. Two membership associations, the Tram-Museum Zürich and the Aktion Pro Sächsitram, also use VBZ tracks to operate occasional heritage tram services.