During the Cold War, Western intelligence agencies developed an immense catalogue of indicators and correlations. If train traffic on certain routes increased, it suggested that army food supplies were being delivered, thus hinting at impending military action.
冷战时，西方情报人员编制了非常复杂的现象和相关性手册。某条线路上列车流量增加表明正在运送军需供给，进而暗示着军事行动即将到来。与此相似，大量运输手纸在预测军事行动方面也非常准确。而苏联人意识到这一点以后，开始不定期地在全国范围内运输虚假物资，这使得本已处境困顿的平民百姓陷入了更为严重的物资短缺。