{"product_id":"tpws-grids-tt-120-scale-pack-of-12","title":"TPWS Grids - TT:120 Scale (Pack of 12)","description":"\u003cp\u003eTPWS (Train Protection Warning System) Grids.\u003cbr\u003eTT:120 Scale.\u003cbr\u003ePack of 12.\u003cbr\u003eSuitable for Peco Code 55 TT:120 Track\u003c\/p\u003e\u003c!--split--\u003e\u003cp\u003eTPWS (Train Protection Warning System)\u003cbr\u003eTT:120 Scale\u003cbr\u003eSuitable for Peco Code 55 TT:120 Track\u003cbr\u003e\u003cbr\u003ePack of 12 Grids\u003cbr\u003e\u003cbr\u003eTPWS (Train Protection Warning System) is a train protection system used throughout the British passenger main-line railway network.\u003cbr\u003e\u003cbr\u003eThe purpose of TPWS is to stop a train by automatically initiating a brake demand, where TPWS track equipment is fitted, if the train has:\u003cbr\u003e- passed a signal at danger without authority\u003cbr\u003e- approached a signal at danger too fast\u003cbr\u003e- approached a reduction in permissible speed too fast\u003cbr\u003e- approached buffer stops too fast.\u003cbr\u003e\u003cbr\u003eTrack mounted transmitter 'grids' are secured to sleepers on the approach to the signal that applies the brakes on trains going too quickly to stop at the signal. Grids are also installed adjacent to a signal, and activated when the signal is at danger.\u003cbr\u003ePack of 12 Grids:-\u003cbr\u003e- 5 Single Grids\u003cbr\u003e- 5 Double Grids\u003cbr\u003e- 2-Speed Control Grids\u003cbr\u003e\u003cbr\u003eNOTE - these TPWS Grids are \u003cspan style=\"text-decoration: underline;\"\u003enot\u003c\/span\u003e suitable for Hornby TT:120 Track, an option for this type of track will be available soon.\u003c\/p\u003e","brand":"West Hill Wagon Works","offers":[{"title":"Default Title","offer_id":55627914740087,"sku":"3WH0602703","price":5.29,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0938\/4175\/2439\/files\/667.jpg?v=1755602844","url":"https:\/\/www.whww.co.uk\/products\/tpws-grids-tt-120-scale-pack-of-12","provider":"West Hill Wagon Works","version":"1.0","type":"link"}