SBB GmbH, also known as SBB Deutschland, is a railway company that operates services in Germany and the cantons of Basel-City and Schaffhausen in Switzerland. It is a subsidiary of Swiss Federal Railways, the state railway company of Switzerland. It operates various S-Bahn services in Baden-Württemberg near the border with Switzerland, some of which service stations in Switzerland.

SBB GmbH was formed in 2005 from the merger of two companies: a different SBB GmbH, and EuroTHURBO [de]. Swiss Federal Railways founded the original SBB GmbH in 2002 to operate the S5 and S6 services of the Basel S-Bahn. That company was based in Lörrach, near Basel. THURBO, itself a subsidiary of Swiss Federal Railways with support from the canton of Thurgau, founded EuroTHURBO in 2003 to handle THURBO's cross-border operations on the Seehas route, which belongs to Bodensee S-Bahn (Lake Constance S-Bahn).^[1]

In addition to the Seehas and Basel S-Bahn services, the company began operating the Schaffhausen S-Bahn service between Erzingen and Schaffhausen in 2018, and between Singen (Hohentwiel) and Schaffhausen in 2022.^[2]

As of the December 2023 timetable change,^[update] SBB GmbH operates the following services (Seehas and S62 also perate for Bodensee S-Bahn):^[3][4]

• Basel S-Bahn:
  • S5: half-hourly service between Weil am Rhein and Steinen, with peak service to Zell (Wiesental)
  • S6: half-hourly service between Zell (Wiesental) and Basel Bad Bf
• Schaffhausen S-Bahn:
  • S62 Rhyhas: half-hourly service between Singen (Hohentwiel) and Schaffhausen
  • S64: half-hourly service between Erzingen (Baden) and Schaffhausen
• Bodensee S-Bahn
  • S6 Seehas: half-hourly service between Engen and Konstanz

SBB GmbH owns 20 Stadler FLIRT multiple units and 4 Stadler GTW 2/6 railcars.^[5]