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They are not just "placed" strategically to make it easier to get engineering trains to site, they are used for single line working when emergencies such as a broken down train or track fault arises.
If you notice, many crossovers on the main line are in pairs, one facing and one trailing to allow SLW over the section.
Many are also groundframe operated. NWR has realised that they are a risk and that's probably why they have been plain-lining them for a while.
Eg - Sutton Weaver GF has been removed during the remodelling by COLAS
Not entirely sure of all Grayrigg facts, but paperwork is still filled in after all inspections. Mostly that's all maintenance is - examining track and keeping records. No doubt, someone that works for NWR will try and tell me otherwise. But, I know and it's boring, that's why I left!
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