The British Rail Class 143 is a diesel multiple unit, part of the Pacer family of trains introduced between 1985 and 1986. They originally worked in the North-East of England but were later transferred to Wales and South-West England.The Rail Vehicle Accessibility (Interoperable Rail System) Regulations 2008 require that all public passenger trains must be accessible by 1 January 2020. No Pacer trains currently meet this requirement.