It is integrated into the Vorarlberg Transport Association (VVV) [de], which manages ticket pricing.

Liechtenstein and northeastern Switzerland are within the Ostwind Transport Association [de] transit district.

Since 2023, several railway stations on the main line are also served by long-distance trains of WESTbahn to Wien Westbahnhof.

With Buchs SG and St. Margrethen as their western termini, both the S2 and S3 provide cross-border connections to services of S-Bahn St. Gallen and InterRegio (IR) trains to destinations in Switzerland.

In Bregenz, Feldkirch and Bludenz, there are connections to RJ and EC services to other cities in Austria, Hungary and Slovakia.

S-Bahn and REX 1 trains run on separate tracks of the Vorarlberg railway line in intervals of less than ten minutes.

[9] As of December 2023, the S2 service operates over the Feldkirch–Buchs railway, which connects Feldkirch (Austria) with Buchs (Switzerland) via Schaan-Vaduz (Liechtenstein), crossing two country borders.

The former R and REX trains on the route became S-Bahn services but retained their old stopping pattern.

ÖBB signed an agreement[17] to purchase up to 300 new Bombardier Talent 3 units for delivery from mid-2019.