The Four Lines Modernisation (4LM) programme is a major Transport for London (TfL) project to upgrade the Circle, District, Hammersmith & City and Metropolitan lines. The aim is to boost capacity, with trains running faster and much closer together, improving journey times and train frequency.
The modernisation work includes installing a new communications-based train control (CBTC) system to allow new trains and the control centre to ‘talk’ to each other by radio. This means installing approximately 450 radio antennae every 150m in the tunnels.
London Underground (LU) and Thales turned to TRS to find an efficient, fast and cost-effective way to carry out the installations.
We proposed to use mobile elevated work platforms (MEWPs) as they have the ability to easily reach any required part of the tunnel profile. They also offer efficiency benefits, allowing teams to achieve more in the limited time available during possessions.
We chose the Promax RR14 EVO rail-mounted MEWP for the job. Over the coming weeks we worked closely with the TfL team to modify the plant so it met the special constraints needed for operation in LU’s tunnels.
With TRS, TfL and our suppliers working together to formulate, design and make the practical modifications, the MEWPs were approved in less than 3 months.
Four significant alterations were made:
Following the modifications, TfL issued its Certificate of Technical Performance for Rolling Stock, a Plant Approval Certificate and a Use of Plant Safety Plan for the Promax RR14 MEWPs to enable and authorise them to be used on the project.
A total of eight MEWPs were modified for use on the 4LM programme and are being used to install the 450 antennas, as well as the cable runs and other associated equipment.
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