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Trains could be prevented from going through red signals by a device being
patented by Intelligent Cab Systems of Kent (GB 2356277). British trains have an
automatic warning system that sounds an alarm if a driver passes a red or yellow
signal. It does not stop the train. The AWS is activated by a magnets in a box
beside the track. The new device superimposes an alternating magnetic field on
top of the fixed field of the existing magnets. This can encode a range of
specific messages from 鈥渃lear鈥� to 鈥渄anger鈥�, and brakes the train if the driver
fails to act. The advantage of this system is that it can be bolted onto the
existing warning system without interfering with it.