The Wohlen–Dietikon railway line is a railway line in Switzerland. It connects Wohlen and Bremgarten in the canton of Aargau with Dietikon in the canton of Zürich. Passenger service on the line now forms part of the Zürich S-Bahn, branded as the S17, and a frequent service is provided, with trains running up to every 15 minutes. Today the line is owned and operated by Aargau Verkehr AG (AVA), a company that operates other rail and bus services in the region.