TPWS. Cadizm. TPWS. TPWS. TPWS. TPWS. Cadizm. Cadizm. TPWS. Click On Left Mouse Button To Advance. TPWS. TPWS. Cadizm. Cadizm. TPWS. TPWS: Overview. TPWS is a system designed to reduce the number and. consequences of Signal Passed At Danger (SPAD).
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TPWS is a system designed to reduce the number and
consequences of Signal Passed At Danger (SPAD)
incidents, and also to reduce the risk of excessive train
speed causing an accident.
TPWS is designed as an add-on to AWS. The train driver
Remains responsible for observing lineside signals & speed
restrictions, two additional controls are provided to intervene
in high risk situations.
the brakes of a train passing a signal at danger.
the brakes of a train going too fast towards :
A SIGNAL AT DANGER; A SPEED RESTRICTION;
A BUFFER STOP
of equipment are within this position.
8m to 23m
Corresponds to the “Set Speed” of the sensor in metres per second.
Where a conflict occurs in the full overlap of a signal, that signal
is now referred to as an inner signal. The signal in rear now referred
to as an outer signal, which is also fitted with a TSS as a minimum
The need for an OSS on an outer signal is dependent on whether
there is adequate Safe Overrun Distance to the conflict point of the
Where a TPWS fitted signal has converging routes in rear,
just as with AWS consideration must be given for OSS’
on both routes.
However since the requirement for an OSS is based upon
an inadequate SOD which itself is derived from an attainable speed
The requirement for an OSS on a converging route can be alleviated.
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