Automatic locomotive signaling continuous type of action - a system of traffic safety on railway transport, performing continuous data about signal indication traffic light standing in front of train in form of coded signals from ground devices of automation and telemechanic to control post of rolling stock. Failures in ALSN operation occur more often due to exceeding the limits of normative values of time parameters of code signals or their distortion under the influence of many destabilizing factors, which can be divided into subjective and objective. Subjective factors are those that depend on the actions of maintenance personnel, taking into account gross violations of instructions and regulations governing the basic requirements for design, installation and current maintenance of ALSC devices. To achieve a significant reduction in the impact of such factors can be development of a set organizational and technical measures: continuous technical training of staff; providing staff with the necessary instrumentation and spare parts; aligning the volume of work performed by the number of staff and other activities. To the objective factors are caused by design features and technical parameters of the system ALSC (primary parameters of equipment and rail line, the allowable currents asymmetry of train speed), external influences (temperature changes, humidity, mechanical impact, electric traction current, the intersection of railroad with power lines, lightning, etc.). The combination of a huge number of factors translates the failure of ALSC due to output parameters of code signals beyond the regulatory limits in category of random events. If the causes of failures are precisely established, it is possible to take measures that, for specific operating conditions of floor and locomotive devices, will lead a low probability of failure. In article considered work of automatic locomotive signaling (ALS) continuous type action. Proposed and developed in MATLAB Simulink an adequate mathematical model of ALS devices with a signal current frequency of 25 Hz. Considered stages and results computer modeling of generation, transfer and recognition of code combinations 'Green', 'Yellow', 'Red-Yellow' are presented.