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Signalling control
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== Gallery == <gallery class="center"> File:Signalwoman Birmingham 1918.jpg|Interior of a [[Great Central Railway|Great Central]] box near Annesley, England (September 1918) File:Jay Interlocking jeh.jpg|Jay Interlocking, [[Long Island Rail Road]], [[Jamaica, Queens|Jamaica]], [[New York City]] File:CTA loop junction.jpg|[[Chicago Transit Authority]] [[Signal box|control tower]] at a busy loop junction File:Harris Switch Tower.jpg|Harris Switch Tower at [[Harrisburg]], Pennsylvania File:Harris Switch Tower interlocking.jpg|The interlocking inside the Harris Switch Tower File:Brum New St Signal Box.jpg|[[Birmingham New Street Signal Box]] File:New railway signal box in Tornio 20240921 001.jpg|A signal box at the railway station in [[Tornio]], Finland File:PA049573 (2941336260).jpg|Signal box at [[Woking]], England </gallery>
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