Keisei AE series (1972)

Keisei AE series
A Keisei AE series train in revised livery in the early 1990s
In service	1973–1993
Constructed	1972–1978
Number built	42 vehicles (7 sets)
Number in service	None
Number preserved	1 vehicle
Formation	6 cars per trainset (later 8 cars)
Operator(s)	Keisei Electric Railway
Specifications
Car body construction	Steel
Doors	1 per side
Maximum speed	105 km/h (65 mph)
Electric system(s)	1,500 V DC
Current collection method	overhead
Track gauge	1,435 mm (4 ft 8 1⁄2 in)

The Keisei AE series (京成AE形^?) was a DC electric multiple unit (EMU) train type operated by the private railway operator Keisei Electric Railway on Skyliner limited express services to and from Narita International Airport in Japan. The "AE" stood for "Airport Express". First delivered in 1972, the trains operated between 1973 and 1993, and were replaced by Keisei AE100 series EMUs.

Five 6-car sets were delivered in March 1972, entering service from December 1973 on reserved-seat limited express services between Keisei Ueno in Tokyo and Keisei Narita before the opening of the nearby Narita Airport. The new Skyliner services started on 21 May 1978, serving the original Narita Airport Station (present-day Higashi-Narita Station), and a further two six-car AE series sets were delivered in time for the start of these services. The sets were lengthened from six to eight cars from July 1990 ahead of the start of services to the new Narita Airport Station directly beneath the airport complex in March 1991. Lengthening the sets involved rebuilding some of the original driving cars as intermediate cars, forming a fleet of five 8-cars sets from seven 6-car sets, with two surplus cars being scrapped. The AE series sets were gradually phased out from June 1990 with the introduction of new AE100 series sets, and a final "" working ran on 27 June 1993.

Following the withdrawal of the fleet, the bogies and control equipment were re-used with new bodies to form a fleet of five 8-car 3400 series commuter EMUs.