At some locations around the country (Masborough Junction is a prime example), there is a fully signalled loop. However, this has been disconnected at both ends, and is heavily overgrown. Is there any reason for such loops/tracks to remain in situ? Or is it a case of not being worth the time and effort to remove the track and alter the signalling?
In many instances (Romford Down Main springs to mind) the loop is removed, the points are replaced by plain track, the signal is bagged, and all the Network Change procedures are carried out - but then the signal, points and tracks are still left in the interlocking, with the point detection false-fed. This saves the cost of updating the SSI/Smartlock/Westlock logic for no great benefit.
There was a project a few years ago whose aim to remove redundant ground frames and the like across the inner bits of the Great Eastern and West Anglia lines, but it never got implemented.
But leaving "old stuff" in can be taken too far. Motts Lane Level Crossing at Witham has been closed, and a bridge opened there, for at least 10 years now. There are still 23 separate treadles, all requiring maintenance, wired in to the signalling logic. If they don't operate correctly beneath each train, signals remain at red and trains get delayed. Never mind the fact that the crossing that they operate has been closed for a decade.