A 66-foot British fleet operated for Thameslink, 700001-700060 [Eight car set] & 700101-700155 [12-car set]. It just started in June 2016, before that 2015 for testing running between Bedford & Brighton. https://en.wikipedia.org/wiki/British_Rail_Class_700 https://en.wikipedia.org/wiki/Govia_Thameslink_Railway https://en.wikipedia.org/wiki/Midland_Main_Line https://en.wikipedia.org/wiki/Brighton_main_line