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Original Text (Annotation: EPW056171 / 503597)

' Intermediate signal box. These were plentiful on the pre-colour light signal railway. They divided the distance between main signal boxes, so allowing an increase in line capacity with trains running closer together through shorter block sections. When traffic was low they were often 'switched out', their signals being left off (line clear). Colour light signals could be controlled from much further away (or indeed automatically) so the need for these boxes disappeared, the spacing of the signals rather than the spacing of the signal boxes now controlling line capacity. '

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