
Devices Used for Positioning Rail Signals
Aug 22, 2024
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At True North Rail we have developed a new signal sighting tool based on Unreal Engine named TrueSight™. Unreal Engine is provided by Epic Games who are an American video game and software developer and publisher. It is an open, state-of-the-art game engine, originally used to build video games. It has completely evolved from simply being a gaming engine to being used by a number of industries to deliver cost effective, immersive virtual worlds, to model designs before any construction takes place. It is also used extensively in the film and TV industry.
True North Rail’s Unreal-based system can be easily loaded with other CAD inputs and enhanced with imagery from site photos and train cab ride footage to provide a very flexible and smooth image of the signal design, which can be easily modified and modelled to assist the SSC with their sighting recommendation.
However, there are other forms of signal sighting methods being used:
1. Signal Sighting Forms and Boards
Signal sighting forms are essential tools that help record and assess the visibility of signals from the driver's perspective. Signal sighting boards, sometimes used temporarily, replicate the position and appearance of the actual signals, allowing sighting committees to evaluate visibility in real-world conditions. These boards help ensure that signals are visible from the necessary distances and angles.
2. Sighting Distance Measuring Devices
These devices are used to measure the exact distance between the signal and the driver's eye line. Accurate measurement is crucial because it ensures that drivers have enough time to observe and respond to the signals, even at high speeds. Laser rangefinders and total stations are often employed to calculate these distances with precision.
3. Computer-Aided Design (CAD) Software
CAD software plays a vital role in planning and simulating signal placement. Engineers use this software to create detailed models of the railway infrastructure, including tracks, signals, and surrounding environments. Simulations can be run to predict how signals will appear to drivers, accounting for factors like track curvature, elevation, and potential obstructions. This allows for adjustments before any physical installation begins.
4. Height Gauges and Laser Levels
Height gauges and laser levels are used to ensure that signals are installed at the correct height relative to the track. This is important because signals must be within a driver's direct line of sight. These tools help maintain the consistency and accuracy of signal placement across the railway network.
5. Site Surveying Tools
Before signal installation, comprehensive site surveys are conducted using tools like theodolites and GPS devices. These surveys provide detailed information about the track geometry, terrain, and any potential obstacles. The data collected ensures that signals are positioned optimally and that their placement adheres to regulatory standards.
6. Signal Positioning Truesight™
At True North Rail we have developed a Platform called Truesight™ which runs on the Unreal Engine. Within Truesight™ is a specialist set of tools for the positioning and Sighting of assets such as Railway Signals. The tool set can used to analyse and verify the best positions for signals based on sighting rules and railway standards. The Truesight™ platform takes into account various factors, such as train speed, signal spacing, and environmental conditions, to determine the safest and most effective placement.
By using this array of equipment and technologies, the UK rail industry ensures that signals are positioned safely, minimising the risk of accidents and ensuring smooth and efficient train operations.