Installing CBTC in the Underground means installing radio antennas in the tunnels – approximately 450 of them – all linked by cables back to the control centre. The method originally envisaged for the fixing of the signalling equipment in the tunnel areas was to use mobile scaffold towers. These would obviously have to be continually erected and dismantled, configured for access to the required parts of the tunnel profile at every one of the 450 antennae locations, and all within the very ...
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