The S42 is a regional railway line of the Zurich S-Bahn that operates only during rush hour (Monday to Friday) between Zurich and Muri. At , trains of the S42 service usually depart from one of the surface level tracks () 3âÂÂ18.
The service calls only at some stations between Zurich (canton of Zurich) and Othmarsingen (Aargau), but at all stations between Othmarsingen and Muri.
The S42 operates during peak-hours only: four trains from to (and three trains in the opposite direction) in the morning, and four trains from Zürich HB to Muri AG (and three in the opposite direction) in the evenings. The journey between Zürich and Muri AG requires 48 minutes.
Services are operated by modernized SBB RBDe 560 (NPZ/Domino) trainsets.