Input (grade 10): Blackpool was the only town in the UK that retained its trams, and between 1962 and 1992 Blackpool had the only urban tramway in the UK.
Output (grade 5): Blackpool was the only town in the UK that kept its trams. Between 1962 and 1992 Blackpool was the only town with a tramway in the UK that was not a preserved system.