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 Refinery a year. Today the Teesside Refinery is a crude oil reception, storage and trans-shipment installation. Operations consist of both processing and tanker loading facilities and cover a site. Stabilised oil is stored in a tank farm at Greatham. A corridor containing pipelines, communications and utility services links the two sites, operated jointly by 270 employees. In its 35 years of operations, the terminal has processed over five billion barrels of oil, seen 15,000 ships visit their jetties and had a first-class safety record. The plant has also been run with a downtime of less than 24 hours in 30 years.