For modellers of the contemporary scene, these important safety devices are now seen all over the UK rail network. Typically there will be 4 grids placed on the approach to a signal, two postioned side by side on the final approach to a signal, and two others spaced apart further back. If a train is monitored to be travelling too fast the brakes are automatically applied. Make sure you don't let your trains get out of control! Each pack contains 12 TPWS Grids, with some simple assembly required. The support bars may need some trimming to fit. Available now from your model shop.