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
Teesside High School become fully co-educational. Children can start the school’s Little Diamonds Nursery at the start of the term in which they turn three years old, attending on a full-time or part-time basis. The school is a registered provider of the Early Years Provision for three and four year olds and accepts all employer nursery voucher schemes. Teesside High School Sixth Form is a provider of post-16 education. The school unveiled its new Sixth Form block in May 2014. Teesside High School was named in the Top Ten North East Independent Schools by The Sunday Times in 2015. The school achieved 100%