Sentence:  This arrangement remains firmly in place 21 years later, although it will almost certainly succumb to being fully <WSD>resignalled</WSD> within the next 15-20 years as part of the policy adopted by Network Rail in 2011 to centralise signalling and migrate control of the entire network to 12 Rail Operating Centres (ROCs). 
Meaning of the word marked with <WSD> tags:  To equip (a railway) with new signalling equipment