sentences:  The two companies shared a chairman, Sir George White, who in January had taken some buses out of service in Bristol to send to Middlesbrough when a rival company had tried to start a competitive service.The Middlesbrough order was followed by a number of trucks for the Royal Navy Air Service.The Great Western Railway bought a controlling interest in the tramway company in 1929 but the bus interests of the railway were transferred to Western National in 1931.