In 2007 ÜNLÜ involved in the İstanbul Marmaray CR1 Project as a sub-consultant firm of Marubeni Corp. After re-establishing the tender, ÜNLÜ was responsible for 43 suburban station and 18 depot maintenance facilities. The international experience drives transportation references quickly. There are Metro Lines and Stations, Maintenance Depots, Rail Terminals, and Tunnel project experiences explained in detail below.