The AM5-M2 and AM4-M4 are two series of
Alstom Metropolis
The Alstom Metropolis is a family of electric multiple units designed and produced by the French rolling stock manufacturer Alstom. It is designed for high capacity rapid transit or metro rail infrastructure systems. Trains can be run in variou ...
heavy rail rolling stock that operate on lines
M2 and
M4 of the
Budapest Metro
The Budapest Metro ( hu, Budapesti metró) is the rapid transit system in the Hungarian capital Budapest. It is the world's oldest electrified underground railway system, and the second oldest underground railway system with multiple stations, ...
.
Since 2009, 22 AM5-M2 sets have been constructed for use on Line M2 with delivery to be completed by 2013. A further 22 AM4-M4 sets have been constructed since 2012 for use on Line M4 with delivery due to be completed by 2014.
On December 5th, 2016, an accident occurred on
Metro Line M2 which involved an AM5-M2 rolling stock. An incoming train collided with a waiting train at the
Pillangó utca metro station
Pillangó utca (lit. Butterfly street) is a station of the M2 (East-West) line of the Budapest Metro. The station was open on 2 April 1970 as part of the inaugural section of Line M2, between Deák Ferenc tér
The Deák Ferenc square (''Deák ...
. This was the first serious accident in the history of the Budapest metro. The accident did not result in a fatality, but according to the prosecution, a total of twenty-one were injured, five of whom were classified as serious. The unit was scrapped soon after the accident.
When the trains were received in 2010, it was revealed most units came totally defective which delayed their entry to revenue service. The accident on December 5th, 2016, was eventually the result of a braking system failure on the AM5-M2 unit. The similar units on line M4 came 99.8% reliable, and no defects present in them.
References
{{Budapest-metro-stub
Budapest Metro
Alstom multiple units