The Company's visions for such an extended network of trams were not to be, and they looked instead to convert their tramways to trolleybus routes. To assess what was available, a demonstrator from Richard Garrett & Sons was tried out in December 1925, and another from Ransomes in November 1926. Rotherham Corporation has been running trolleybuses since 1912, but were reluctant to allow Mexborough and Swinton vehicles into the town. However, the two sides reached an agreement in 1926, under which Rotherham would convert its section of tramway ready for trolleybus operation and allow Mexborough trolleybuses to reach the town centre, while Rotherham vehicles could run over Mexborough's routes to various termini. The necessary powers were granted by an Act of Parliament obtained in 1927, which also allowed them to extend the system. At the eastern end, the wires were extended from the Dale Road terminus along Low Road to Brook Square. This was known as Conisbrough Low, and the Company were hopeful that Doncaster wiring would eventually extend to that point, enabling the two trolleybus systems to connect. Another route from Dale Road ran up a hill to Conanby, where there was a new housing estate. This was known as Conisbrough High. The Company were also talking to the Dearne District Light Railway about the possibility of them constructing a new route from Bolton on Dearne to Manvers Lane.