Objective: To analyze modifications of cyberattacks on online technical documentation of railroad security systems. Methods: The specificity of railroad automation and telemechanics (RAT) documentation maintenance in electronic document management systems was estimated and presented. Also the assessment of enforceability of cyberattacks under actual operating conditions was given. Results: The possibility of critical failure of train control systems resulting from cyber faults of error type in technical documentation was demonstrated. A classification of cyberattacks on electronic databases of technical documentation was introduced. Vulnerability of the latter was uncovered. Practical importance: The necessity to develop special security measures for electronic databases of RAT technical documentation was justified. It concerned cyber faults of error type. Moreover, practical implementation alternatives of security methods in case of cyberattacks were introduced.