 This is left blank if an adult is travelling at full (undiscounted) fare; but if any discount or other special condition applies, a code of up to five letters appears.The change of name from "Student Railcard" to "Young Persons Railcard" preceded the introduction of these systems by four years, so the status code used has always taken the form Y-P.However, in the earliest days of APTIS and PORTIS, this code was rendered Y - P, with spaces between the letters and the dash.