The U7 line is the largest subway line not just in Germany, but the entire European continent with 40 underneath stations & almost 32 km (almost 20 miles) between Rudlow on the south side & Spandau on the north side with reversing points on either side. Future extention just below Rudlow into Berlin Airport after the city's government approved in 2015 (published a plan in 2014). The construction already begin last year until 25. Over at Mierendorffplatz, a one track island station on both levels: southbound on the upper level & northbound on the lower level. At Mehringdamm, a four track & 2 island station with connection to the U6 line across the platform. TML Studios released in 2009: the World of Subways - Volume Two on computer simulation game. Choose F90 (a married car set) or H01 fleet (a six car entire set). The line operated on April 9th, 1924 the six decades later on the first day of October 1984. There are 12 districts around the area. More information, please go to: https://wikipedia.org/wiki/U7_(Berlin_U-Bahn)
I liked playing this on World of Subways, in terms of game play however, it is all underground and gets old quickly. Maybe U1 and U3 would provide more variety.
An updated version of the U7 for Trainz 2004 originally by M-R-Software is available with the original game as part of the download. I run it on Windows 11 with compatibility for XP service pack 2 no problem https://u7-trainz.de/