The R3 is a railway service of RER Vaud that provides hourly service between Vallorbe and Aigle in the Swiss canton of Vaud. A limited number of trains continue to St-Maurice. Swiss Federal Railways, the national railway company of Switzerland, operates the service. The service was previously known as the S3.

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R3
An S2 at Arnex in 2009; the S2 became the S3 in December 2022
Overview
Predecessor	S2 S5
First service	11 December 2022 (2022-12-11)
Current operator(s)	Swiss Federal Railways
Route
Termini	Vallorbe St-Maurice
Stops	29
Distance travelled	97.9 kilometres (60.8 mi)
Average journey time	1 hour 31 minutes (Vallorbe–Aigle) 10 minutes (Aigle–St-Maurice)
Service frequency	Hourly
Line(s) used	Simplon line
Route map Legend hh:mm R4 to Le Brassus Regional services to Pontarlier 0:00 Vallorbe R4 0:06 Le Day R4 0:12 Bretonnières R4 0:14 Croy-Romainmôtier R4 0:19 Arnex R4 0:25 La Sarraz R4 R1 R2 to Yverdon-les-Bains 0:31 Cossonay-Penthalaz R1 R2 R4 0:35 Bussigny R1 R2 R4 R5 R6 to Allaman 0:39 Renens VD 0:45 0:47 Lausanne R5 R6 R9 to Puidoux 0:50 Pully R1 R2 R4 0:52 Lutry R1 R2 R4 0:54 Villette VD 0:57 Cully R1 R2 R4 0:58 Epesses 1:02 Rivaz 1:03 St-Saphorin R7 to Puidoux Regional services to Les Pléiades 1:09 Vevey R4 R7 1:10 La Tour-de-Peilz R4 1:12 Burier R4 1:14 Clarens R4 1:17 Montreux R4 Regional services to Les Avants Regional services to Les Rochers-de-Naye 1:18 Territet 1:20 Veytaux-Chillon 1:24 Villeneuve R4 1:27 Roche Regional services to Leysin Regional services to Les Diablerets 1:31 Aigle R4 Regional services to Monthey-Ville Regional services to Villars-sur-Ollon 1:36 Bex R4 Regional services to Monthey 1:41 St-Maurice R4 Regional services to Martigny [1][2] This diagram: view talk edit

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The R3 operates every hour between Vallorbe and Aigle, using the western end of the Simplon line. The R3 makes all local stops between Vallorbe and Cossonay-Penthalaz and between Lausanne and Aigle. The R3 is paired with the R4 between Le Day and Aigle, providing half-hourly service. The R4 makes a limited number of stops between Lausanne and Aigle. Both the R3 and R4 provide limited service beyond Aigle to St-Maurice.^[3][4]

The "first" S3 was one of the six original lines of the RER Vaud, then called the Vaud Express Network (French: Réseau express vaudois, REV), when that system was established in December 2004. It ran hourly between Allaman and Villeneuve, on the Simplon line.^[5] With the December 2020 timetable change, the S3 was cut back to Lausanne, with the S5 taking over the Lausanne–Villeneuve service.^[6]

The RER Vaud lines were substantially reorganized for the December 2022 timetable change. The "new" S3 was a combination of the former S2 and S5, making local stops on the Simplon line between Vallorbe and Aigle, with limited service from Aigle to St-Maurice.^[7] On 10 December 2023, all RER Vaud lines were renamed as "R" and a number, instead of "S."^[8]