Charlotte Area Transit System (CATS) Supplementing Audio Frequency Track Circuits with Axle Counters | USA
Train DetectionUnited States of America

Charlotte Area Transit System (CATS) Supplementing Audio Frequency Track Circuits with Axle Counters

Operator
Charlotte Area Transit System
Country
United States of America
Partner
HNTB
Segment
Metro
Application
Level Crossing Protection
Products
FAdC®, RSR180
Year
2022
Scope of project
6 counting heads

At the Charlotte Area Transit System, frequent false red signal overruns resulted when electromagnetic interference caused “bobbing” of the line’s audio frequency track circuits. The Frauscher Advanced Counter FAdC® was subsequently considered as an alternative to these track circuits to eliminate the occurrence of false red signal overruns.

The operators of the Charlotte Area Transit System, at the advice of consultant HNTB, agreed to utilise the FAdC® for a shadow mode trial to determine if it would solve its prevalent issue of false red signal overruns. The main reason for consideration of the axle counter was its high immunity to the electromagnetic interference, which was causing this issue, as well as its ability to interoperate with the existing audio frequency track circuits. The trial was conducted at the Archdale Interlocking for nine and a half months, generating the expected positive results. The data indicated that although numerous events of track circuit “bobbing” occurred during the trial period and generated false overruns, the axle counter data showed that if it had been in service, these overruns would have been prevented.

The FAdC® was able to increase the availability and safety, ensuring consistent and smooth operation of this light rail line. The axle counters were then used to entirely replace the existing AF track circuits, after the vital testing was successfully completed and the personnel was fully trained. After finalisation of these important steps, the Frauscher Advanced Counter FAdC® was placed in revenue service.

Elimination of false red signal overruns

Protection against environmental conditions and electromagnetic interference

Similar Projects
This might also interest you
1/5
Train DetectionChina

Tram Huangpu Line 1

Tram Huangpu Line 1 (HP1) line is located in urban areas with high traffic density and passenger volume as well as many level crossings. The adverse weather conditions can cause flooding of the track bed and add to the challenges for reliable system availability and operations.
Train DetectionUnited Kingdom of Great Britain and Northern Ireland

London to Corby

The project was part of Network Rail’s Midland Main line electrification programme and involved re-signalling between Bedford and Kettering. The goal is the reduction of industry costs and environmental benefits through lighter rolling stock, reduced fuel costs and lower carbon emissions.
Train DetectionChina

Chengdu Tram Line 2

Chengdu Tram Line, located in the capital Chengdu City of Sichuan Province, is the first tram line to be operational in the city since 2018.
Train Detection, ServicesIndia

Sini - Chandil Railway Line

The Sini-Chandil railway line is a crucial rail connection located in the state of Jharkhand, which lies in the eastern coastal region of India. This railway line holds significant strategic importance for the entire region, and now incorporates Frauscher solutions, including the Frauscher Advanced Counter FAdC®, Wheel Sensor RSR180 and the Frauscher Insights applications Diagnostics and Motion.
Train DetectionUnited Kingdom of Great Britain and Northern Ireland

Axle Counter Overlay System

Between London St Pancras International Station and Farringdon Station, there is a history of frequent flooding through the tunnels that adversely affected the reliability of the existing train detection system. Due to this, the installation was non-operational during large periods. However, being a mainline section and a core route through London, high reciliation to any sort of failures is vital.