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RAIL TRACK 300

Audio Frequency Track Circuits

On 1520 mm gauge railways and metro lines track circuits are still the most important tool for track vacancy and track integrity control, as well as for signal indication transmission from tracks to trains. The RAIL Track 300 track circuit system is designed for sections with AC and DC traction or with two traction current systems, as well as for sections with a high level of electromagnetic noise. It is fully adapted to the conditions of the 1520 mm gauge railways. Multi-bit code telegrams, sent to the track circuit via a phase-shift keying signal, are generated at the track generator output.

Advantages

A unique code for each track circuit within the entire railway system. This eliminates the risk of false track circuit vacancy due to feeding from the adjacent track circuits due to the noise or signal impact from the generator of the adjacent and any other track circuit, even at the same carrier frequency.
Easy code setting and key adjustment configuration, semi-automatic track circuit adjustment during commissioning, ensuring the system flexibility and minimum operating costs.
Two adjustable parameters are the generator voltage and the receiver sensitivity.
Eight operating frequency ranges — from 1.5 to 2.6 kHz.
Built-in track circuit control and monitoring.
In most cases, a slow-acting relay is not required, because the required deceleration is ensured by the receiver.
Compact design saves space.
The code message is 31 bits.

HIGH NOISE IMMUNITY

Application of correlation reception of signals, error controlled codes, binary phase-shift keying and higher frequencies ensures the stability of the RAIL TRACK 300 circuits to the effects of traction harmonics and other electromagnetic interference. This reduces significantly the risk of false signal of the occupied block section or point section, resulting in failures in the transportation process. False vacancy signal resulting in violation of the safety rules for train traffic is excluded.

LOW OPERATING COSTS

The RAIL TRACK 300 track circuit is adjusted once when the track circuit is put into operation due to the semi-automatic selection of the receiver sensitivity using the configuration key and adjustment shunt. Re-adjustment due to changes in the insulation resistance of the track circuit is not required. This reduces the human factor impact on train traffic safety.

HARMONIZATION

The system is able to interact with the most systems of higher automation level and to adapt to connection to the existing wayside infrastructure of track circuits. The nomenclature of receivers and generators is minimal: one receiver and one generator, regardless of frequency.

TECHNICAL CHARACTERISTICS

The system is able to interact with most signaling systems of a higher level and can be adapted to connect to the existing wayside infrastructure of track circuits. The range of receiving terminals and generators is minimal — one receiver and one generator irrespective of frequency.

Characteristics of track circuits (the basic product and adaptation to the environment of the Russian Railways):
Characteristics	The basic product	After adaptation
The length of a track circuit	From 50 m to 2 км	From 25 m
The area of additional shunting	20 m	Up to 1,8 km 40 m
Minimal specific resistance of the track line insulation	2 Ohm·km	1 Ohm·km
Maximum resistance of the train shunt	0,15 Ohm	0,06 Ohm
Rail breakage detection	No	Yes
Interface with ATP	No	Yes
Russian track interface components	No	Yes
Correspondence to the Russian national frequency standards	Partial	Full
Operation temperature range	—30...+70 °С	—30...+70 °С
Core section of signaling cable	3,08 mm²	0,64 mm²
Seasonal adjustments	Twice a year	Not required

LABORATORY OF TRACK CIRCUITS

Our company has scientific, engineering and laboratory facilities at its disposal to carry out science-based works in the field of track circuits in the following directions:

theoretical and experimental research;
development and design;
electromagnetic compatibility with electric equipment of a rolling stock.

The laboratory of track circuits is equipped with unique precision equipment that makes it one-of-a-kind in the industry. The tasks of experimental determination of relay interlocking properties, analysis of receiving equipment resistance to traction current noise, research of the noise level of relay interlocking and ATP on a rolling stock, track and at a traction substation can be solved at a high metrological level with the help of measurement and registration equipment.

The laboratory has high-qualified and experienced specialists who have been successfully developing relay interlocking and providing electromagnetic compatibility for many years and who are ready to solve the problems of the industry. Currently, the laboratory is working on the adaptation of the RAIL Track 400 track circuits for the Russian Railways.

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