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 Development Corporation left a legacy of limited and "often inappropriate and threadbare development". The areas it regenerated are clearly marked by distinctive TDC statues. Teesside Development Corporation The Teesside Development Corporation was a government-backed development corporation that was established in 1987 to fund and manage regeneration projects in the former-county of Cleveland in North East England. The Teesside Development Corporation developed several schemes, many on former industrial land on both sides of the River Tees and around Hartlepool ranging from housing, commercial, light industrial and leisure projects. Its flagship developments included the Tees Barrage, Hartlepool Marina, Teesside Park and Teesdale Business Park.