High Quality Content by WIKIPEDIA articles! The Midland Metro is a light-rail or tram line in the West Midlands of England between the cities of Birmingham and Wolverhampton via West Bromwich and Wednesbury. It is owned and promoted by Centro, and operated by West Midlands Travel Limited, a subsidiary of the National Express Group (NEG), under the brand name Travel Midland Metro (TMM). The line averages about five million passengers annually, and this number appears to have reached a plateau, about one third of that predicted by Centro in the planning stage.