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The Train Protection & Warning System is a train protection system used throughout the British passenger main-line railway network, and in Victoria, Australia.
The British Rail Safety and Standards Board's definition is:
The purpose of TPWS is to stop a train by automatically initiating a brake demand, where TPWS track equipment is fitted, if the train has:
TPWS is not designed to prevent SPADs but to mitigate the consequences of a SPAD, by preventing a train that has had a SPAD from reaching a conflict point ahead of the signal.
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