 Central station provides regular services to London Paddington via Bristol Parkway, with other links to Swansea and West Wales on the South Wales Main Line while other national services connect Cardiff with Bristol Temple Meads, Birmingham New Street, Nottingham, Manchester Piccadilly, Southampton Central and Portsmouth Harbour.Improvements to the north-south Wales rail networkwere introduced in 2010 and there are now services every two hours that connect Wrexham General, Llandudno and Holyhead in North Wales to Cardiff in the south.Cardiff has an urban rail metro network operated by Transport for Wales known as "Valley Lines".