It was the first city in the United Kingdom to re-introduce trams to the streets with the 1992 opening of Manchester Metrolink, which is currently undergoing significant extension and is now the largest network in the UK, having surpassed the Tyne & Wear Metro. As of August 2020 it has 99 stops, with the line to the Trafford Centre having opened in March 2020. No underground system exists in Manchester, however this was proposed on numerous occasions before the Metrolink tram system was built.