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Railway Point Circuit Introduction To re-cap The Controlling Lever The Point Control circuit The Detection circuit The WL Control circuit The Lever Lock circuit The Indication circuit Point Detection The P&LD Box The Three Position WKR Railway Point Circuit Railway Point Circuit Introduction The majority of points used on the London Underground are pneumatically operated, the […]
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Railway ‘N’ Style Frame Four Foot Point Circuits ‘N’ style frames are manually operated and at the time of writing (March 2007) are still in use, mainly on the SSL lines. However these will be gradually phased out as lines are re-signalled. In essence, the circuits used to control the points are very similar to […]
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