 The first opening took place in 1907 and was owned by the National Electric Construction Co., becoming part of the British Electric Traction Group in 1931.A tramway connecting Rotherham, Mexborough, Swinton and Denaby had been authorised by an Act of Parliament obtained in 1902.It was constructed by the National Electric Construction Co Ltd, and operated by its subsidiary, the Mexborough and Swinton Tramways Company, from its opening in 1907, with the private company running its trams over Rotherham Corporation's tracks at the Rotherham end.