 A goalkeeper, Moulson made his international debut in a 2–0 defeat to Portugal on 23 May 1948 in the Estádio da Luz, Lisbon.Moulson played in the semi-final of the FA Cup on 25 March 1939, Wolverhampton Wanderers played Grimsby, in a FA Cup semi-final at Old Trafford.The attendance of 76,962 remains Old Trafford's largest ever attendance.