Neumarkt, Germany, 18 May 2005 -
Compatibility confirmed for operations of UM71 DC track circuits with RHEDA 2000®
• Range of train-detection signalling reports is comparable to that of ballasted track
In advanced rail traffic operations with train speeds of over 160 km/h, uninterrupted train control and protection functions are critically necessary. In addition to visual signalling techniques, the train driver must on his display see trustworthy information on the occupation status of the track section ahead, as well as on the next signal. Owing to non-uniform developments in the various national railway systems, different systems with impact on the conduct of train traffic have developed in the respective countries.
So-called track-status report systems are installed to determine and report on whether or not rolling stock is occupying defined track sections ahead of a train. These systems work on the basis of DC circuits or axle counters, depending on requirements. The UM71 DC circuit system feeds an audio-frequency signal into both rails. A certain, specified minimum sound-signal level is required to assure correct reporting of the occupation status of a track section. The impedance in the rails and the track connections attenuate these signals, in accordance with the distance between transmitters and receivers. In addition, the frequencies used in the system produce characteristic inductive voltage losses. These phenomena make it necessary to install specified transverse capacitance between the two rails, at regular intervals.
About the PCM RAIL.ONE Group
The PCM RAIL.ONE Group has been manufacturing concrete sleepers and track systems for urban transit and long-distance rail transportation for over 60 years. The technology leader also offers its expertise in the fields of engineering and plant construction. Its customer-driven innovations fulfill the highest quality standards and are installed around the world
The PCM RAIL.ONE Group is comprised of several companies and eleven production facilities with a presence in Germany, Romania, Saudi Arabia, Spain, South Korea, Hungary, Turkey, the United States, and India. It maintains annual capacities of over 5 million track sleepers and 750,000 linear meters of turnout sleepers.