TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).


TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).

The current Network Rail UK protection systems are TPWS and AWS. The functionality of both systems is combined in a single system, generally referred to as TPWS. TPWS comprises of OSS (Overspeed Sensor System) and TSS (Train Stop System).
 
The OSS system automatically applies the vehicles emergency brakes when the vehicle exceeds the posted speed over an active OSS transmitter. The TSS system automatically applies the vehicles emergency brakes when the vehicle passes an active TSS transmitter installed at stop signal. AWS gives train drivers an audible and visual indication of the status of the signal ahead. If the driver does not acknowledge the indication of a caution signal the AWS system automatically applies the vehicles emergency brakes.
 
Mors Smitt TPWS system is based around a TPWS Control Unit to which all other AWS and TPWS equipment is connected. For simplification however, the complete train borne TPWS system can be split into four distinct elements, these being the Control Unit, AWS Receiver, TPWS Antenna and Cab Controls and Indicators.
 
 

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TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).

AWS Acknowledge pushbutton

The AWS Acknowledge pushbutton is part of the suite of cab controls and is mounted in a location easily accessible by the driver when seated in the active driving position.
TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).

AWS Alarm

The AWS Alarm is mounted inside the cab and gives an audible notification of the status of the next signal. A chime (or bell) is sounded when the signal is clear and a warning tone (or horn) when it is caution.
TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).

AWS Alarm and Indicator

On most vehicles operating in the UK the AWS Alarm and Indicator functions are combined in a single unit.
TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).

AWS and TPWS Test Equipment

  • Mors Smitt can supply all necessary test equipment to ensure the vehicle interfaces correctly with the track equipment. This test equipment is used to ensure that the installation complies with the relevant standards throughout the life of the vehicle.
  • Mors Smitt can supply first of class characterisation, commissioning and maintenance testing equipment.
TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).

AWS Indicator

The AWS Indicator (or sunflower) is mounted in the cab in the drivers field of vision whilst looking at the track ahead. It shows the status of the last AWS signal received by the TPWS Control Unit.
TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).

AWS Receiver

The AWS Receiver is mounted under the train, also ideally on the bogie, and senses the track mounted AWS magnets and transmits their polarity to the TPWS Control Unit.
TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).

Other Cab Controls

Mors Smitt also supply all the remaining switches required for a complete trainbourne TPWS installation.
TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).

TPWS Antenna/Aerial

The TPWS Antenna is mounted under the train, ideally on the bogie, and senses the frequencies generated by the track mounted TPWS equipment and transmits them to the TPWS Control Unit.
TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).

TPWS Control Unit

The TPWS Control Unit is the heart of the TPWS system and is mounted inside the vehicle. It processes the inputs from the other system components as required by Railway Group Standards GE/RT8030 (TPWS) and GE/RT8035 (AWS).
TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).

TPWS2 DMI (Driver Machine Interface)

All new vehicles entering service must now be fitted with an upgraded version of TPWS to GE/RT8030 Issue 4 and part of this upgrade is the addition of a DMI. The DMI is mounted in the driver’s desk as required by location of primary controls rules.
TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).
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Train Protection Warning System (TPWS) and Specifi…

Combining service-proven TPWS with a new standardised ETCS interface