Requirements for the Train Protection and Warning System (TPWS)
This document mandates the requirements for the Train Protection and Warning System (TPWS), the primary purpose of which is to minimise the consequences of a train passing a TPWS fitted signal at danger and a train overspeeding at certain other locations on Network Rail managed infrastructure. Additionally, it can be expected that TPWS will reduce the number of signals passed at danger (SPADs) at TPWS fitted signals.
This document has been up-issued to issue four to incorporate changes arising from proposals relating to power-up testing and in-service monitoring of TPWS trainborne equipment. Sound files for audible alerts have also been incorporated into this document.