The British Rail Class 717 Desiro City is an electric multiple unit passenger train built by Siemens Mobility, currently operated by Govia Thameslink Railway on its Great Northern Hertford Loop and Welwyn stopping routes. Built to replace Class 313 trains on services into Moorgate, a total of 25 six-car units began entering regular service from March 2019. The units are stylistically similar to the Class 700s (in use with Thameslink) and the Class 707s (in use with Southeastern and South Western Railway.)