<p>Most of the early semaphore signals were two-position types with horizontal for danger and angled down for all clear, these are referred to as 'lower quadrant' systems.
Occasionally, junction signals will be found with the arms mounted above each other.
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This type of signal is relatively rare, and is used only on goods lines and low-speed areas.
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<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nottsexminer/6094236648/">Midland Railway Junction signal</a>
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