 Machines on the South West Trains network sometimes use stock with reference RSP 3595/30; a VAT number is printed on the reverse of these, above the batch reference.Before the machine or machines at a given station were installed, an analysis was undertaken of the most popular destinations for tickets bought from that station (or, strictly speaking, tickets issued "with that station as an origin point" - encompassing tickets bought at the station's ticket office, if applicable; those issued on trains by conductors using SPORTIS machines; and those issued remotely).It is believed that these statistics were used in conjunction with a more long-term forecast of the most likely destinations passengers would choose, in order to establish a set of destinations to be programmed into the machine.