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Anywhere Network Rail feels like putting them.
They are used to my knowledge on all areas except those with 3rd rail.
Overhead electrification does not pose a problem.
Not normally used on the high speed main lines but are found on the slow lines alongside.
Many branches in the North West and North East have had many miles of them installed.
I was involved in laying about 25 miles of them on the Hull _ Seamer line over about 4 years.
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