This paper contains materials of fi rst paragraph of unreleased manuscript «Development of Signaling, Interlocking and Line-Block on Russian Railways» written by the fi rst head of «Automation and Remote Control on Railways» department of Leningrad institute of railway engineers Nikolay Vasilyevich Lupal. It contains features of signaling and communications on railways during considered period.
Tsarskoye Selo Railway, semaphore line, electrical telegraph, signaling, semaphore