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UK4 Aspect



4 Aspect colour light signals are used on uk mainlines and other lines with intensive services. They allow closer headways between trains than the equivalent 3 aspect signal.

Signal Type Example Use
uk4 Basic 4 aspect signal
uk4-ti 4 aspect signal with theatre indicator. The theatre indicator is used where there are multiple routes from a signal and displays a letter or number to display the route set.
uk4A Four aspect signal with “A” plate to indicator automatic operation
uk4AAngled Four aspect signal with offset head and A (automatic plate)
uk4DT Four aspect signal with “dt” plate. The dt plate indicates that the signal is track circuited
uk4DTAngled Four aspect signal with dt plate and offset head
uk4FDT Four apsect signal with dt plate and “Following” signal (or “calling on”)
uk4JL Four aspect signal with left junction indicator. Use where the secondary route diverges to the left. The white “lunar” lights indicate the route is set to the left when lit
uk4JLDT Left junction signal with dt plate
uk4J2L Signal with junction indicators for two left routes. Use the “J” and “J2″ markers in indicate the routes for each indicator
uk4JLR Signal with indicators for left and right diverging routes. Use “J” indicator for left route and “J2″ for right indicator
uk4JR Signal with right-hand junction indicator. Use where the secondary route diverges to the right. The white “lunar” lights indicate the route is set to the right
uk4J2R Signal with junction indicators for two right routes. Use the “J” and “J2″ markers in indicate the routes for each indicator
uk4JRDT Signal with right route indicator and dt plate
uk4JRDTAngled Offset signal with right route indicator and dt plate
uk4R Four aspect signal for use on the right of the track
uk4RA Right side signal with A plate
uk4R-ti Right signal with theater indicator
uk4T Four aspect signal for use in tunnel
uk4T-ti Tunnel signal with thatre indicator
uk4W Wall mounted signal. For use in confined locations where there isn’t enough room for a normal signal post.
uk4W-ti Wall mounted signal with theatre indicator. For use in confined locations where there isn’t enough room for a normal signal post.
uk4O Overhead signal for gantry mounting
uk4OJL Overhead left junction signal
uk4OJR Overhead right junction signal
uk4OGLX Overhead junction signal for use on goods loop. See Goods Loops
uk4OGLM Overhead junction signal for use on main line at goods loop. See Goods Loops


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