Radio-telephone

Another interesting feature of the Falaise is that she is provided with a Denny Brown stabiliser to minimise rolling, and amenities for the passenger include the provision of a radio telephone service, which is available on passage.

Source: wiktionary

Recently the L.M.R., in conjunction with Pye Telecommunications and the G.P.O., has been conducting trials between Crewe, Lancaster, Birkenhead, Liverpool and Manchester with a brakevan fitted up with radio-telephone equipment and beamed on G.P.O. radio-telephone stations in the Manchester and Liverpool area.

Source: wiktionary

In accordance with Southampton Docks practice for shunting engines during the past four years, a radio-telephone in the cab allows two-way conversation with the Dock Traffic Control Office.

Source: wiktionary