the 420 series were still in service on the S8 and S9 lines. In exceptional cases or in case of vehicle shortage a use of the series 420 in the entire network was possible, so that in very rare cases even to use z. B. came on the lines S5 and S6, which were converted in 2005 on the trains of the series 423. The use of the 420 series in the network of the S-Bahn Rhein-Main ended in the night of November 3, 2014. A sale and other options - depending on the condition of the remaining units - according to the media checked, but has been since the end of the already most of the remaining railcars have been scrapped. An official museum train was not kept by the S-Bahn Rhein-Main. However, a private association of railway friends in Gießen was able to take over the unit 420 298 on a permanent loan and undertake regular special services in the Frankfurt area with this railcar, which they also work up (initially in their last operational condition). Class 423 While Stuttgart and Cologne were already supplied in 1999 with the successor series 423 and Munich between 2000 and 2004, the entire vehicle fleet exchanged, Frankfurt began in 2003 with the partial renewal, after 2002 for testing purposes, a few railcars of the S-Bahn Munich in the S-Bahn Rhine-Main were used. Since October 2010, 100 series 423 multiple units have been running in Frankfurt am Main (third series: 301-305, 325-334, fourth / fifth series: 372-456). Since June 2006, the lines S1 (with the exception of single roundabouts), S4, S5 and S6 are complete with 423. Since the timetable change on December 9, 2006, the S2 line is also driving with the new railcars. The short commuter trains S8 and S9 from the main station to Frankfurt Airport are partially driven by 423. The line S3 is served since March 28, 2010 exclusively with 423. Initially, the new units were primarily used, which were only approved in early 2010. In the second half of 2014, the trains of the 423 series were also on weekdays in regular operation on the entire route of the S8 / S9 on the way to accelerate the shutdown of the 420 series. Since the end of 2014, the new 430 series has been in use here. A total of 100 units were ordered, which should