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 of approximately 492,954 people. Teesside industry is dominated by the commodity and in many instances, integrated chemical producers of the Northeast of England Process Industry Cluster (NEPIC). These companies are based on three large chemical sites around the mouth of the River Tees at Wilton, Billingham and Seal Sands. These companies make products such as petrochemicals, commodity chemicals, fertilizers and polymers. Teesport is based on the River Tees and is currently the third largest port in the United Kingdom, and amongst the ten biggest in Western Europe. This port handles over 56 million tonnes of goods per annum which are