The trainset consists of driver car (type 410B), motor car (type 309B) and driver car (410B), with four passenger doors per car (two on each side). The 14WE is designed for suburban commuter traffic, with the carrying capacity of 192 seats and (nominally) 255 standing places. It is air conditioned and can be used with platforms 760 to 1,060 mm (30 to 42 in) high.
The trainset has Scharfenberg couplers, which are standard on all Polish EMUs. They are placed at the height of 1,040 mm (41 in), according to an UIC recommendation, whereas the Polish practice is 950 mm (37 in). This creates operational problems in cases of a breakdown.