{"product_id":"tpws-grids-o-gauge-pack-of-8","title":"TPWS Grids - O Gauge (Pack of 8)","description":"\u003cp\u003eTPWS (Train Protection Warning System) Grids.\u003cbr\u003eO Gauge.\u003cbr\u003ePack of 8.\u003c\/p\u003e\u003c!--split--\u003e\u003cp\u003eTPWS (Train Protection Warning System)\u003cbr\u003e\u003cbr\u003ePack of 8 (O Gauge)\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 8 Grids:-\u003cbr\u003e- 3 Single Grids\u003cbr\u003e- 3 Double Grids\u003cbr\u003e- 2-Speed Control Grids\u003c\/p\u003e","brand":"West Hill Wagon Works","offers":[{"title":"Default Title","offer_id":55628909576567,"sku":"7WH0602702","price":7.95,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0938\/4175\/2439\/files\/1901.jpg?v=1755614715","url":"https:\/\/www.whww.co.uk\/products\/tpws-grids-o-gauge-pack-of-8","provider":"West Hill Wagon Works","version":"1.0","type":"link"}