Lancashire & Yorkshire Signalbox Diagram LIGHTHOUSE. A wonderful, full coloured diagram in its original, wooden glazed frame. Shows the simple home and distant signals from St. Annes To Ansdell and states Levers No.2 & 5 To be Normal Before 'Line Clear' Can Be Given and Signals No. 3 & 4 Released By Block In 'Line Clear 'Position. Botom right shows L&YR Signal Department Engineers Office, Manchester,July 17th 1911.