Hijacking this thread slightly, I notice that all along the western section of the Great Western (certainly all the way from Nailsea to Swindon) the cabling troughing is being dug up and replaced. Is this in connection with the forthcoming resignalling of the area? The new troughing looks slightly larger - if so that seems surprising that in an age when most things to do with communications seem to be minitiarised.
It is all to do with the resignalling of the
GWML▸ . The GWML will have modern ETRMS signalling however this is being superimposed over a renewed classic type system which has to be installed in parallel to the old system. Also electrification means screening conductors have to be laid in the troughs the type of screening conductors being used on the
GW▸ will be about 20mm in dia