Ferranti proposed a "transactor" (terminal) that used a custom punched card system. Booking agents at the ticketing offices marked the cards with a pencil to select various checkboxes, then inserted it into the transactor which read the marks and punched those codes onto the edge of the card. Cards would then be collected from any number of operators and fed into a normal card reader, which would read them over telephone lines at "high speed" directly into the central booking computer.