Definition of "overtrack"

Relics of the old GWR broad gauge are rare on the national network. This overtrack canopy was one such, so the decision by the C&WR to retrieve it after electrification necessitated its demolition was a brave one, because its condition by then was parlous.

2021 December 15, Robin Leleux, “Awards honour the best restoration projects: The Chairman's Special Award: Cholsey & Wallingford Railway”, in RAIL, number 946, page 54