Department of the Environment (Railway Inspectorate) / HMSO booklet "Railway Electrification on the Overhead System - Requirements for Clearances," 1966. 4pp with fold-out diagrams. ISBN 11 550227 0.
Department of the Environment (Railway Inspectorate) / HMSO booklet "Railway Electrification on the Overhead System - Requirements for Clearances," 1966. 4pp with fold-out diagrams. ISBN 11 550227 0.
