The term thick web switches most commonly refers to a new [2002] design of sturdier BG switches on prestressed concrete sleepers, which can handle higher turnout speeds. These are made for 1:8.5 turnouts (less commonly, 1:12), with 160mm (less commonly 115mm) throw, and have clamp locks, spring setting devices (SSD), and the ZU-1-160 thick web rail. In 2003 or 2004, IR decided to use these switches on all the Class A routes and other high-density routes with traffic above 20GMT/year. The new switches have been designed to be easily installable on top of existing prestressed concrete sleepers supporting older switches.
Source - IFRCA.org
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