The ðZBAN E22100 series, commonly nicknamed Gulf dolphin (), are Electric Multiple Units that were built by Hyundai Rotem for ðZBAN A.à Â. in order to increase its fleet. Each set has 3 permanently coupled cars and are used for commuter service in ðzmir. The first set entered service on 30 August 2014 and the last one (40th) on 31 December 2015.