During World War II it built airfields at Broome, Derby, Pearce and Port Hedland.
[4] As well as operating trucks that moved goods to and from ships docking at Fremantle, by 1950 it had commenced hauling manganese to Meekatharra and iron ore from Koolyanobbing to Southern Express for onward movement by rail services.
[8] In the late 1950s it was responsible for the construction of RAAF Base Learmonth briefly operating an Avro Anson aeroplane.
[10] On 9 September 1965 Bell Brothers was listed on the Sydney, Melbourne and Perth stock exchanges.
[22][23][24] In May 1991 the transport business was sold by Boral to Heytesbury Pty Ltd, the family company of Holmes à Court's widow Janet.