The article presents the materials of the second section of unpublished manuscript of a monograph «Development of signalling, centralization and blocking devices on Russian railways», that was written by N. V. Lupal, the first head of the department of Automation and Remote control on railway transport of Leningrad Institute of railway transport Engineers. The section highlights the features of control of the power switches and signals within the period of review.
St. Petersburg - Moscow railway, centralization, semaphore, switch, lock