06.09.18
Track-based 3D scanner accurately models rail network in industry first
In an industry first, Network Rail Scotland has used a track-based three-dimensional scanner to accurately model the railway infrastructure ahead of the arrival of new trains.
With LNER Azumas, Class 365s and Class 385s on the way, as well as growing freight demand, there is a crucial task ahead of ensuring the fleets actually fit on existing lines.
To accomplish this, Network Rail’s team of absolute track geometry (ATG) engineers deployed the Trimble GEDOScan system to collect detailed information about the track and surrounding features such as bridges, parapets and platforms.
The system is capable of gathering precise, high-resolution data for use in track clearance assessments on structures and tunnels.
It was rolled out in April and has since been delivering higher-quality scanning and modelling faster and more accurately than ever before – with a relative precision of less than 5mm. As with other technologies being deployed by Network Rail, it also boosts workforce safety by removing staff from the tracks.
Graham Hutchinson, ATG engineer with Network Rail in Scotland, said: “Three-dimensional scanning provides more, and more detailed information in a shorter time which reduces the need to be on the track; making it safer as well as more efficient.
“This system is ideally suited to tunnel surveys where irregular construction can make it difficult to locate the main pinch points. The three-dimensional scan measures the full extent of a tunnel precisely in about a fifth of the time than it took previously.
“It can also be used for proactive monitoring to inform maintenance requirements and to better predict and prevent faults and to reduce disruption for passengers.”
The scanning system has been used across the network to carry out general surveys for maintenance and monitoring, as well as to assess the capability and suitably of specific routes to carry certain types of rolling stock. For example, it helped determine the possibility of operating Class 158s on the West Highland Line, as well as HSTs on the network between Scotland’s seven cities.
Surveys have also helped analyse the network for future freight capacity growth.