NS DDZ (Full name: DubbelDekkerZonering) were built by Waggonfabrik Talbot (now Bombardier Talbot), De Dietrich Ferroviaire (now Alstom DDF) and Adtranz between 1992 and 1998 and are operated in the Netherlands by Nederlandse Spoorwegen (NS). This class is a type of an electric multiple unit and was delivered in two batches as DDM-2 and DDM-3. A trailer cars of this multiple unit can also be operated with a Class 1700 electric locomotive instead of a motor car, forming a push-pull train. The trains were formerly known as NS DD-AR (full name: Dubbeldeksaggloregiomaterieel) From 2009 the NS DD-AR were modernised to transform them from Sprinter to Intercity. Types of coaches Bvs (270) These are the driving trailers at the end of the sets. Each set features them. There are 79 coaches, they are 26.89 metres long and seat entirely second class. They can seat 120 people, 64 on the upper deck, 52 on the lower deck and 4 near the doors. They also feature a toilet. The trains are numbered from 270 7001 to 270 7079. Bv (280) These are the coaches connected to the ABv, Bv, mDDM or the locomotive. Each set features them, either one, two or three. One or rarely three if with an mDDM and 2 if with a Class 1700. There are 103 coaches, they are 26.40 metres long and seat entirely second class. They can seat 140 people, 64 on the upper deck, 64 on the lower deck and 12 near the doors. The trains are numbered from 280 7201 to 280 7302, 280 7508. 280 7508, which was converted from first and second class to second class only seats 124, it was previously numbered 380 7508. ABv (380) These are the coaches connected to the Bv and Bvs. All sets feature one. There are 76 coaches, they are 26.40 metres long and seat both first and second class. They have 64 first class seats and 60 second class seats, for a total of 124 seats, 56 on the upper deck, 56 on the lower deck and 12 near the doors. The first and second class seating is the same on both decks, 32 first and 24 second. The trains are numbered from 380 7501 to 380 7507, and from 380 7509 to 380 7577. mDDM (390) These are the motor coaches connected to the Bv. Only 50 sets feature one. mDDMs are 21.39 metres