94 four-car units (47 trains) built between 2007 and 2011, and first
entered service in July 2009.
Each eight-car train is formed of 2 four-car units. Every odd-numbered unit
must be coupled with an even-numbered unit. All coupled unit numbers are
sequential.
Each unit is formed of a driving motor car (DM), a trailer (T), a
non-driving motor car (NDM), and an uncoupling non-driving motor car (UNDM).
These cars are numbered 110xx-120xx-130xx-140xx.