Sighting Distances

Rail companies can make use of video routinely recorded by their fleet of asset inspection trains in order to automatically detect and categorise signals, report their position, and the position from which it can be sighted. Signal and level crossing sighting distances need to be regularly measured and kept in check for compliance. Vegetation overgrowth, installation of new trackside equipment, or incorrect placement of certain assets around track bends can make it difficult for the train driver to spot such assets in time which can lead to fatal accidents. EnVision software tools allow for signals and level crossings to be automatically detected and for their sighting distances to be measured based on object tracking methodology.
Our systems detect lineside vegetation and measure its distance from the running rail. Where signal sighting distances are affected by the presence of foliage such as trees, the system identifies particular trees and bushes to be cut back in order to achieve the required sighting distances as shown below.

By either tracking the position and heading of the running rails, or interpreting track geometry data from recording trains, the system can also calculate where foliage needs to be cut back in order to provide the necessary sighting distance on curved track. This is demonstrated below.

The core benefits of the above system includes:

• Automatic reporting of signals and their type (gantry, post etc) in any format
• Automatic signal sighting for maintenance purposes
• Detection and reporting of foliage and its proximity to the running rail
• Prioritisation of foliage management activities


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