County Borough of Teesside councils in 1918, and was a pioneer operator of electric trolleybuses. The three undertakings adopted a common livery of turquoise and cream in 1967 in preparation for their amalgamation. On 1 April 1968 the combined fleet became Teesside Municipal Transport. Teesside initially operated a mixed fleet of trolleybuses and omnibuses, but on 4 April 1971 trolleybus operation ended. A formal closure ceremony was held two weeks later. Before 1968 the Teesside area was served by three police forces: Middlesbrough Borough Police, Durham Constabulary and the North Riding of Yorkshire Constabulary. It was originally envisaged that the new county borough would
County Borough of Teesside county. The recommendations were accepted, with boundary adjustments, by the Government in October 1965. The main changes were to exclude most of Saltburn & Marske, and the extension of the boundary of the county borough southwards. Part of Preston-on-Tees was added to include Preston Hall, an art gallery and museum owned by Stockton Corporation within the county borough. In January 1967, Anthony Greenwood, Minister of Housing and Local Government, made the Teesside Order 1967 to carry the recommendations into effect. The new borough of Teesside was to combine the areas of: Following its passing by both Houses of Parliament, the