The double decker trains were built by Alstom from 2004–2008, with 43 units being delivered, either in a two-car or three-car configuration.

Among crew and technical support the vehicle early got nicknamed "Flodhäst", in English "Hippo - big, gray and unpredictable".

The double deckers have a little higher passenger capacity than conventional cars, with 85 compared to 78 seats.

There is air conditioning, signal boosting for mobile telephones, electrical plugs at each chair, that is also equipped with radio.

These problems have been addressed through rebuilding the interior, which also included removing all vending machines and coffeemakers from the trains themselves.

The trains are specified for regional commuter traffic, and some complaints come from passengers on longer journeys.