Network Rail currently operates around 500 signal boxes ranging from the modern-day power boxes to the traditional mechanical lever frame boxes. A quick scan through the list of operational signal boxes shows there are still many mechanical lever frame boxes in operation on the British railway network with a wide variance in size and age…
– Full Blog by Edward Kendal (RailwayManiac.com)
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Calling All Stations 
[…] How many Mechanical Lever-Frame are left in the UK? More than you’d think. […]