sentences:  With exception to the Blackpool system, London Underground and Glasgow Subway – all current UK light rail systems are of modern construction and were built as 'new' for 'one-man' operation.British buses also once had 'operational' conductors on most services, most buses were front engined meaning the passenger saloon door had to be behind the driver's cab.The last buses to have a conductor are in London on the remaining AEC Routemaster double-deck buses, otherwise all UK buses are 'one-man operated' or OMO.