This route covers the S5 and S6 lines and this route already exist in TS 20XX. S5 runs from Frankfurt Süd to Friedrichsdorf and includes 17 stations. Additionally, like with the S5, the S6 also begins at Frankfurt Süd but ends at Friedberg with 21 stations and both routes use the DB BR 423. However, the DB BR 423 made its debut in TSW 2 with the Hauptstrecke München – Augsburg DLC, which released on October 22, 2020. Map: From Steam page: The S5 and S6 lines are represented in full, covering their shared-track section from Frankfurt Süd to Frankfurt West, including 6 underground stations, before each head for Friedrichsdorf and Friedberg respectively - covering some 60 km of high frequency rail en route.
