Great Train Robbers 'planned second Royal Mail rail heist' The source also gave an incredibly detailed description of the crime and all the other names on the list were later prosecuted. One of the two was Henry Smith, who had a criminal record dating back to 1947, and was only traced after a nine month manhunt. Officers could find no evidence to link him to the hideout used by the gang after the robbery but concluded "there was not the slightest doubt in our minds of police that Smith... was one of the robbers actually at the scene and taking a very active part in the commission of the offence." They believe Smith - who died in 2008 - spent his money from the raid on buying, through associates, "32 houses (including a row of 11), a drinking club and a hotel in the Portsmouth and Gosport districts." The second individual on the list who was never charged - even though police concluded he was "strongly suspected" - is still alive. The files also lend credence to theories that the original gang included a high ranking Post Office official who passed on details via an intermediary. A total of 17 people faced trial for the robbery, but it is thought there were four other men who helped rob the train, as well as several more who assisted in the organisation, who were never prosecuted. The individuals involved in planning the second raid are not known and several of those involved in the first one had already been arrested by the time it was allegedly being planned. However, police believe there was a clear overlap between the two. The files suggest the gang due to carry out the raid on the Weymouth-Waterloo line would be "at least on the scale of the one that carried out" the first one and, according to some reports, the haul targeted would be up to £6 million - more than twice that stolen from the Glasgow train. The raid was expected to happen early in the New Year 1964, when large amounts of money was due to be transported by rail. The first vague tip-offs were received in September 1963. Then, just before Christmas that year, the officer leading the hunt for the Great Train Robbers, Commander George Hatherill, received further information from three sources about the second operation. According to one document, the intelligence "suggests very strongly that an attack ... was being planned by criminals some of whom were connected with the (original) gang." In response to the threat, officers launched a major operation, code-named "Primrose" - apparently because many of the suspects were connected to an address near Belsize Park, with a "Primrose" telephone code. It involved a survey of the 130 mile track to likely areas for an ambush. Some of the intelligence suggested it would take place at Weybridge, in Surrey, but other locations were also considered. A control room was set up, in Hampshire, to operate each night that the service was running, to receive regular signals from the train and ensure it was safe. Checks were also made on vacant or suspicious properties within a 20 mile area each side of the line, in case the gang had already set up a hide-out, in which to lie low after the raid, as they had done after the earlier heist. Police were particularly concerned that the gang could use caravans in the New Forest. However, detectives also considered that the gang might try to flee straight away with their haul, so established check points to stop traffic. Arrangements were also made to allow police to pursue suspects across county borders. Extra security measures were introduced on the train, with security officers travelling on board and window bars, alarms and loud hailers fitted. The operation lasted four months, but officers eventually concluded that although the original intelligence had been accurate, the gang had abandoned their plans in response to the security measures. Mr Cook said: "It was clear that the threat was taken extremely seriously."