As the new AEM-7 locomotives continued to arrive, Amtrak assigned them to haul crack "Metroliner" trains with Amfleet consists and reassigned the less-reliable Metroliners for the secondary Philadelphia–Harrisburg service, calling them Capitoliners. On October 25, 1981, the service was rebranded as "Keystone Service". All service was then operated by the Metroliners, which lacked the quick acceleration of the Silverliners and Arrows and made them unsuitable for the service. After a single Metroliner set was withdrawn from "Clocker" service in March 1982, the "Keystone Service" was the only remaining use of the Metroliners. On April 24, 1983, a pair of weekday trains – the 9:54am arrival and 3:55pm departure from Suburban Station – were renamed "Keystone Executive". Intended to attract riders from the western end of the corridor, the trains made intermediate stops only at Lancaster, Downingtown, and 30th Street, with a 99-minute schedule.