maintained until the end of 2003, when the S-Bahn Stuttgart handed over the orange-white and orange-pebble-gray units to Frankfurt. After just over a year, the S-Bahn were completely painted red by the z-position of the last orange-pebble-gray unit 420 376 early 2005. Until 2005, there was also the last pebble gray orange 420 (apart from 420 001) in Frankfurt, but this train was scrapped in the spring of 2005 in Trier-Ehrang. In 2009, when the use of the class 420 at the S-Bahn Rhein-Ruhr was completed, the Essen depot delivered several ET 420 of the fifth and sixth series to Frankfurt. Although the Frankfurt plant made great efforts to align the railcars to the Frankfurt units (for example, most railcars were still redesigned in 2007), they were in such poor condition by the end of years of poor maintenance in North Rhine-Westphalia that From then on, they were usually taken out of service directly at the end of the investigation period. In parallel, four Stuttgart trains of the seventh series were relocated to Frankfurt in July 2009. After the main inspection, three of them were initially deployed from mid-June, primarily on the S7 and the airport short-commuter (S8 / S9), later normal in mixed operation with older units on all ET 420 rides. In the spring of 2014, another train of the seventh series and four trains of the eighth series were relocated from Stuttgart to Frankfurt in order to absorb a shortage of vehicles resulting from deadlines in older 420s. This was also the only period in which the eighth series in Frankfurt was in use. After an early deployment was already foreseeable at that time, no great efforts were made to adapt the car to the Frankfurt railcar - some of them were in the interior until the withdrawal with Stuttgarter advertising stickers. The 65 remaining trains of the 420 series were still in operation until November 2014. Since the conversion of the S7 and some of the S1 (which had previously been performed by 420s since the autumn of 2013) to the new 430 series in May 2014 made numerous 420s redundant, the phasing out progressed sharply. Another reason for this was the expiry of the examination period of many vehicles, while at the same time main examinations were no longer worthwhile due to the manageable remaining service life. In the last months of operation, trains of