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 two-tier system of counties and districts. One of the new counties "Area No.4" was based on the Teesside conurbation. The county was eventually named Cleveland on the suggestion of several local authorities in the area. Originally it was intended that Teesside would continue as non-metropolitan district of Cleveland. Peter Walker, Secretary of State for the Environment stated in January 1972: "It would be wholly wrong... to divide again the County Borough of Teesside... it has made all its investment in a county borough of that size, and it would be wholly wrong to tear it to pieces." However, the boundaries