Long-retired private seller, net proceeds go to the considerable cost of acquiring these at the time from the stations. APTIS was the Accountancy and Passenger Ticket Issuing System, mainstream machines were used on the British Rail/National Rail network from October 1986 until June 2007, a wide variety of printed cards was used. Decoding the bottom line of a typical ticket: 40029 - serial number of ticket 3611 - serial number of machine 1536M03 - 1536 = National Location Code for Luton Station (still current) 1536M03 - M03 = London Midland Region + ticket window 3 at station