The Aargau S-Bahn (German: S-Bahn Aargau or S-Bahnen Aargau) is an S-Bahn-style regional rail network serving the canton of Aargau, Switzerland, with some services extending into the cantons of Bern, Lucerne, Solothurn and Zug and one service to the German city of Waldshut-Tiengen. It operates within the A-Welle tariff network.
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