Railway crossing safety system
The multifunction system for monitoring the railway crossings occupancy manufactured by TVEMA is designed for prevention of accidents at the railway crossings and collisions of railway rolling stock with cars and other vehicles.
The system performs the following functions:
• automated control of the crossing occupancy after the activation of the crossing alarm system to detect the vehicles which remain there;
• control of the warning lights;
• voice announcements about emergency situations with transmission via a radio link at the frequencies of the train or station radio communication;
• 24-hour logging and archiving of the traffic violations and the acts of vandalism at the railway crossings.
The system is based on the dedicated controller which collects and processes data from the optical sensors and controls quick response systems and devices.
The system uses the upgraded version of IR optical sensors commercially manufactured by SPEK (St. Petersburg, Russia). The outstanding feature of these sensors is their quick response and noise immunity. The sensors guarantee the range up to 40 meters without compromising performance at 99 % of optical loss and withstand high wind loads. The sensor operating temperature range is -40°C to +55°C.
The operation of the system is designed in such a way that when the approaching train signal is absent, the system performs consecutive polling to detect the sensor damage, misalignment or stray lighting. If a faulty sensor is detected, the failure signal is generated.
After the approaching train signal has been received and the crossing gates have been lowered, the system starts to scan for obstacles in the crossing area. If the obstacles are detected, the warning system is activated (the voice annunciator at the crossing, transmission of voice warning to the traffic operator or the train driver via a VHF radio, the operation of the warning lights begins). It is also possible to transmit the video data to the monitor located in the driver cab of the approaching train.
When the train is passing the crossing, the scanning stops for the duration of the train's location in the crossing area. Then the scanning resumes and continues until the crossing gates are opened. The video inspection module provides control of the crossing status and serves as an evidential base in the event of traffic violations of the acts of vandalism in the railway crossing area.