The article presents the materials of the second section of unpublished manuscript of a monograph «Development of signaling, interlocking and blocking devices on Russian railways», that was written by N. V. Lupal, the fi rst head of «Automation and Remote Сontrol on Railways» department of Leningrad Institute of Railway Transport Engineers. The section highlights the particularities of railway signaling and communication of this time.
Petersburg-Warsaw railway, Odessa railway: telegraph, signaling, colour light signal